Episode 13 begins with Ji-ung dropping Mi jin off in front of her house. They officially become a couple but Mi jin suggests they keep their relationship a secret, internally hoping that she can revert her curse before publicizing their relationship. After sharing a hug, Mi jin enters her house. Her mother asks about Ji ung while Mi-jin’s father who was outside and had discovers their secret relationship nearly outs her to her mother. She begs him not to say anything while her mom is suspicious. In her room, Mi jin feels bad hearing her mother trying to torture the truth out of her father.
The next day, Byung Duk is confused seeing both Lim sun and Ji ung in a good mood. They are texting each other. He is even surprised when Ji ung doesn’t scold Lim sun when she makes a mistake. Both of them even compliment the gloomy weather. Meanwhile, Lim Sun tries avoiding Ko won but he ends up catching her. She tells Ko Won that she likes someone else, but to her surprise, Ko Won isn’t bothered by this and doesn’t expect anything in return. She tells him he makes her uncomfortable and Ko won likes that thinking she will at least become attracted to him. Lim sun is flabbergasted and runs off.
Meanwhile, Ji-ung is still in an exceptionally good mood, which Byung-duk finds odd. He even eats a meal he dislikes with so much relish and texts Mi jin who is already home but she realizes she left her other mobile phone at the office. Worried that Ji ung and Byung duk who are both pulling an all-nighter might discover her identity, she discreetly goes to the office, retrieves her phone, and comes up with an excuse when she inevitably encounters Ji-ung. She tells him she came to see him which makes Ji ung very happy. He shows her around and Mi-jin feels satisfied about visiting her workplace as her real self. She sits at her desk, reminiscing about herself as Lim sun working there.
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However, Byung duk catches in on them being lovey dovey but still doesn’t realize their romantic relationship. But the two men nearly get suspicious of Mi jin when she accidentally reveals a habit of Ji ung only Lim sun or Byung duk would know or when she seems to know her way around the office like she isn’t a stranger there and knows that Byung duk’s father suffered from diabetes while the three of them are eating cake.
Ji ung escorts Mi jin out and holds her hand, telling her he would wait until she is ready to tell him about herself. He tells her he trusts her and then they hug.
Later, during questioning, Baek Cheol-gyu expresses his wish to talk to Lim Sun. During their conversation, she mentions noticing an odd smell from the culprit’s car, even though she didn’t see the culprit. Lim Sun believes she can help catch the culprit, and in return, Cheol-gyu hands over 24 years’ worth of records on fentanyl distribution in Seohan which surprises Ji ung. When he asks, she tells him that she risked her life for it. Byung duk also asks what her relationship with Baek Chul gyu was and she admits that she forgot he was a person she looked up to in the past.
Meanwhile, former detective Mal Tae and one of the senior interns inform Ji-ung that Cheol-gyu has Parkinson’s disease, which rules him out as a suspect after verifying his medical records.
Cheon hui approaches Ji ung to talk about the case. Lim sun sees her laughing with Ji ung and Byung duk tells her about Cheon-hui’s crush on Ji-ung. So she tries hard to keep them apart at work. Later that night, while at work, Cheon hui tells Ji-ung she will quit and asks if he will like to follow her to Seoul.
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Ji ung calls mi Jin to let her know he will be arriving at her place. Her parents notice her hurrying to dress. When she meets ji ung, he tells her he won’t be able to sleep if he doesn’t see her face and suggests they go out for lunch the next day, but she makes excuses to delay their meeting time until after 7 pm, which makes Ji-ung suspicious. Meanwhile, Cheon hui is enraged by Ji ung’s rejection of her offer.
The next day, Ji ung consults Lim Sun about Mi-jin’s job, but she feigns ignorance, hitting him when he suggests Mi Jin might be hiding something from him. Ji ung is surprised when Lim sun seems to be aware he and Mi Jin are dating but she lies that she overheard her talking about it to Da Yeong.
After work, Ji-ung and Byung-duk have dinner together at Ji-ung’s house. Byung duk feels something is weird with how Mi Jin hesitates going out in the sun. He thinks she might be allergic to the sun. Meanwhile, Lim sun and Da Yeong are eating at the latter’s house. Da Yeong feels that Mi Jin’s parents might soon discover her secret if she keeps staying out but Lim sun feels they are too busy to notice. Da Yeong is worried since she’s dating Ji ung now and suggests she tells him the truth but they’re afraid she will be arrested.
Lim sun suddenly has the urge to poop and while she’s search for toilet paper, Byung-duk visits Da-young’s place under the guise to bring her a meal he had prepared but he’s actually there to investigate Mi-jin’s odd meeting time limits. However, he ends up getting distracted and ends up eating with Da-young, who is obviously fawning over him. Lim sun who sees them feels like dying because of the strong urge to poop. Byung duk leaves after Lim Sun gives up waiting and appears to go to the bathroom just when the two where about to have a spaghetti kiss.
When Byung duk returns to Ji-ung’s place, he has completely forgotten his initial goal of visiting Da-young. When Ji ung asks what he found out, all he can talk about is Da young. Ji ung loses his patience so Byung duk reveals that he saw Lim sun in Da Young’s house, making Ji ung suspicious as he remembers the time she desperately tried to get away from his apartment to Da Young’s in the morning only for him to see Lim sun at Da Young’s place when he came to check on her
Da young is upset as Lim sun crashed her time with Byung duk. Lim Sun then tells her about Byung-duk being a married man. This causes Da young to become heartbroken. Later that night, Ji-ung calls the police officer in charge of the murder case asking for the CCTV footage in front of Mi-jin’s house. After watching it, he is surprised when he spots Lim Sun coming out of her house instead.
The next day at the office, Lim sun is jealous when Cheon-hui asks Ji ung out for coffee. While they are together, she informs Ji-ung about a woman named Gong Eun-sim, who made a deal for fentanyl 20 years ago and has recently bought fentanyl under an alias. The timing of her purchase coincided with a murder investigation Ji-ung and Byung-duk are looking into. Lim sun who has been watching them overreacts due to a vending machine just when Cheol hui is about to ask Ji ung out for drinks. Ji ung helps her get a can out of there, irritating Cheol hui.
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Meanwhile, Ko Won discovers that a cleaning lady has been delivering letters about a senior intern’s false identity. He shows the letter to Lim Sun, who talks to the cleaning lady and finds the real informant. She and Ko Won travel to an address where a woman confesses about the corruption in hiring senior interns which was why she wrote that note. She couldn’t bear that an imposter got the job instead of her. Lim Sun asks who the imposter was. The woman shows her a picture of Na ok hui but clarifies that the current Na Ok-hui working as a senior intern in the office is not the real Na Ok-hui.
Episode 14 begins with Lim Sun realizing that Na Ok-hui is an imposter who met the real Na Ok-hui on the day of the interview and used her identity to secure a position inside the prosecutor’s office. While driving back, Ko won suggests they should run a background check on Na ok hui but Byung duk is busy. He asks to eat with her but she replies that she has plans. Ko won is upset and asks if the man she likes is aware of her secret. Lim sun replies he is not. Ko won tells her to come to him if she needs help to to which Lim sun thanks him.
That night, Mi-jin and Ji-ung have dinner together, where Mi-jin expresses her fear of failing if she starts studying again.With Ji-ung’s encouragement, she tries to read through her old books. The next day, Ji-ung visits Mi-jin’s house on Byung-duk’s advice to meet with her during the daytime. Mi-jin, who overslept had changed into Lim Sun.
After the pleasantries, Ji ung asks Mi Jin’s parents if they know anything about Lim sun. They are shocked that he knows her and tells him Lim sun was the Aunt who went missing.
Lim Sun is discovered by her parents and chased outside. At the police station, she frustratingly relays some information that leads her mother to think that Lim Sun is her sister. Ji-ung also discovers Lim Sun at the police station, and when asks for an explanation, she is unable to provide one. He is angry and feels she betrayed him especially when she can’t tell him about her relationship with Mi Jin.
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Mi Jin’s mother is suspicious that Lim sun may be her sister because of the resemblance. She and her husband recalls the text message they recieved from Lim sun telling them not to look for her. With this, Mi Jin’s mother believes her sister is still alive.
Meanwhile, Da Yeong curses Byung duk when he tries flirting with her believing he’s a married man. That night, she and Mi Jin comfort each other over their relationship troubles. That same night, Mi Jin’s mother waits outside Ji ung’s apartment. When he arrives, she asks him the name of the stalking woman since he obviously knew her. When he tells her, Mi Jin’s mother is shocked, regretting that she didn’t recognize her sister this whole time. Meanwhile, Mi Jin is upset when her dad tells her that her mother went in search for Lim sun. She starts crying as she writes out her letter of resignation, remembering her time at work.
The following day, Lim Sun is met by Baek’s private investigator who gives her an envelope with poppy flowers inside as instructed by Baek. He asks if she can recognize the smell. Lim sun immedietely recognises it as the culprit’s scent.
Meanwhile Mal Tae tells Ji ung to stop smoking when he notices cigarettes around him. Ji ung asks if he knows who he is. Mal Tae recognizes him since he too was in charge of his case and tells him this. He also tells Ji ung that the killer might have killed his Mom because she was a witness. He also thinks the culprit might be someone close.
Lim Sun had asked Byung-duk to do a background check on Na Ok-hui, and he finds that the imposter is actually Gong Eun-sim, the culprit they were looking for. He is about to tell this to Lim sun when she arrives but Ji ung suddenly enters the office and asks to speak with Lim sun. She tells him she’s here to resign, shocking both Ji ung and Byung Duk. Ji ung and Lim sun ignore Byung duk as they go out to talk. She hands him her resignation and apologises but Ji ung is angry thinking she borrowed Mi Jin’s aunt’s name just to get a job. He accuses her of using people’s hearts. She cries that she can’t tell him anything. After forcing the letter into his hand, she runs away.
Lim Sun is packing her things but Byung duk refuses to let her go. He finally tells her about Na ok hui’s real identity as Gong Eun shim. They are shocked by this.
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Elsewhere, Mi-jin’s father, preoccupied with Lim Sun, seeks out Ms Kwak, who is revealed to be Gong Eun-sim. It turns out that Gong Eun-sim used to work as a nurse giving visiting shots. She had visited Baek’s wife and killed her, then went on to kill Mi-jin’s aunt Lim Sun after she smelled foul play through Baek’s prior warning about someone coming to withdraw money from his wife’s account. Ji-ung’s mother happened to witness Lim Sun’s murder.
Years later, Eun-sim killed the original Na Ok-hui to take her place at the office and then killed the senior intern who had accidentally witnessed the murder. Lim Sun breaks open Na Ok-hui’s locker to find poppies in it. Meanwhile, Mi-jin’s father, having mistaken Gong Eun-sim for Ms. Kwak, had paid her 7 million won to find Mi-jin’s aunt Lim Sun 20 years ago. He visits her for the same reason but this time is kidnapped after she finds out he’s Mi Jin’s father
Lim Sun informs Ji-ung from Mi-jin’s number about Na Ok-hui being the culprit. Gong Eun-sim then calls Mi-jin to arrive at a location to save her father’s life. The episode ends with Mi-jin being hit by Gong Eun-sim.
So, it was quite surprising. I never expected the villain to be the sweet old Na ok hui.
As for the story line, it feels just a little underwhelming but it’s still nice to watch regardless.