In the third episode, Mi-jin encounters the perpetrator of the murder case. The man’s car windshield has a piece of paper stuck from the case files. When the man gets ready to harm Mi-jin with his bloody axe as he opens the car door, Gye Ji-ung steps in by saying Mi-jin’s name, causing the attacker to run away.
Mi-jin doesn’t know the man, but she detects an odd scent coming from the vehicle. She questions whether it might be the air freshener but is unable to identify the origin. In the end, Ji-ung takes Mi-jin back to her house and goes back to his own apartment. In the meantime, the murderer pulls a corpse into a poorly illuminated room and uses blood to write “Lee Mi-jin and Lim Mi-jin” on a mirror.
The day after, Mi-jin, alias Lim Sun, receives a civilian award for her courage in saving Ko Won from the acid assault at the district attorney’s office. This is also the time when a new intern, Baek Cheol-gyu, who was previously the director of Hwadong Medical Centre, is brought in.
Simultaneously, Ko Won lavishes Lim Sun with presents that are delivered to Mi-jin’s friend Ga-Yeong’s residence. Mi-jin had created Lim Sun’s persona as Ga-young’s mom.
Afterwards, Ga-young reaches out to Mi-jin regarding the presents, leading Mi-jin to come to Ga-young’s residence in Lim Sun’s physical form. She continuously emphasizes that she is Mi-jin despite her looks and clarifies that her body changes daily.
Ga-young is skeptical until she sees Lim Sun change into Mi-jin at sunset and captures it on her phone. Upon hearing Mi-jin’s detailed explanation of the magical cat’s story, Ga-young agrees to assist in locating the cat.
After the situation calms down at the prosecutor’s office, Ko Won comes on board as a civil servant. K-pop idol Ko Won sparked controversy by being involved in the unauthorized acquisition of sleeping pills, which resulted in his mandatory military service. As a result of a herniated disk acquired at a concert, he was assigned public service duties.
Lim Sun quietly comes up to Ko Won, attempting to give back all the presents, which includes a high-priced car. They agree that Ko Won will purchase her coffee daily. At the same time, Ji-ung looks into the person who attacked Ko Won, believed to be one of his enemies.
Even though fans come to see him every day, Ko Won is filled with fear following the attack. Lim Sun catches him when he goes outside to take medication, and he explains them as vitamins. She reassures him by mentioning, “You are aware that an excess of vitamins can also make you unwell, correct? “Do not go too far,” and gives him a piece of candy. Afterwards, Ko Won throws his pills in the garbage.
In Ji-ung’s workplace, he meets Lim sun who thanks him for the ear phone he discreetly left for her in the office but Ji ung does not react at all to it. Before he leaves in the elevator, Lim sun gives him her favorite sweets. Later, he has a disagreement with an office assistant, resulting in the assistant resigning. Ji-ung asks his employer to approve the resignation. Due to a lack of staff, the chief plans to promote Lim Sun as an office aide to Ji-ung in recognition of her bravery.
In another location, law enforcement discovers the mutilated corpse. Ji-ung gets involved in the investigation and finds out that the victim was mutilated while still alive, suggesting the extreme cruelty of the crime. A similar occurrence had occurred with Ji-ung’s mother as well.
The detective gives Ji-ung pictures of the perpetrator’s vehicle. Ji-ung sees a shady man entering a matching vehicle and pursues him, eventually losing him but remembering the car’s ID number.
He goes to see Mi-jin to discuss the car’s condition. To Mi-jin’s shock, her family arranges for Ji-ung and Mi-jin to have a private conversation in her room in the hopes of them developing a romantic relationship. It’s awkward especially since her room is a mess but they manage to have a conversation and Mi-jin characterizes the vehicle as a silver SUV but lacks certainty. The family escorts Ji ung out and her mother misunderstands their relationship, thinking she has gotten herself a catch.
The next day, Lim Sun goes to work and is with her colleagues to greet the new intern, but senses there is something not right about him. Later, she finds out about her new job and expresses gratitude to Ji-ung for replacing her lost earphones while working, assuring to give her best effort. Ji-ung nods despite feeling confused. The following day, he is shocked to find out that Lim Sun is now working as his office assistant.
Episode 4 proceeds with Im Sun being hired as Ji-ung’s office assistant. Mi-jin is thrilled about her first real job and has her hair and makeup done by Da-young for the important occasion. At the same time, Ji-ung and Byung-duk plan to persuade Im Sun to resign because they believe she is too old for office work and want to replace her with a younger assistant.
For her initial assignment, Ji-ung challenges Im Sun to hand-enter four sets of large case documents within a two-hour time frame, fully expecting her to be unsuccessful. Unfortunately, Im Sun, also known as Mi-jin, had experience working as a part-time chatter and is able to type an average of 1,000 words per minute. The legal pair is amazed by her ability to type proficiently.
Then, they assign Im Sun with the responsibility of making Excel spreadsheets for financial reports, once more confident that an elderly woman would struggle to navigate the program. Much to their surprise, Im Sun not just generates the files but also arranges them using intricate Excel formulas. She is continuously given challenging assignments, but she excels at every single one. Thinking she wouldn’t be able to keep up with their youth, they give her an impossible task to order food and drinks but are shocked when she accomplish that on record time.
While heading back home, Ko Won spots Im Sun, whom he decides to trail. However, she suddenly changes into Mi-jin when he isn’t looking, leaving him puzzled.
The following day, Im Sun is assigned the impossible job of visiting a witness who lives on a mountain by noon. Yet, Im Sun, a level 10 rock climber because of her part-time job as a cleaner, opts to climb the mountain rather than hike it. The legal pair ultimately surrenders in their attempts to force Im Sun to resign.
Afterwards, as Da-young distributes flyers for the lost cat, Ji-ung and Byung-duk delve deeper into the acid attack investigation. Traces of Fentanyl are discovered in the accused’s blood, leading them to speculate that a drug patch could be the source of information. Drug addicts illegally obtain and abuse fentanyl, which is intended to relieve pain in patients.
Upon his return home, Ji-ung ponders the reason behind the murderer’s visit to the crime scene on the same day Mi-jin came across them. Ji-ung comes to the conclusion that he is searching for something… or someone.
The following day, Ji-ung requests Mi-jin to meet him after her shift while assigning Im Sun additional tasks as well. Meanwhile, Ji-ung and Byung-duk become wary of the acid attacker’s motives as his behavior appears illogical. He left clues throughout the entire journey. Ji-ung is curious, pointing out that the assailant purchased the acid on the internet, creating a simple electronic path. They choose to look into every transaction involving Fentanyl.
Later, Ji-ung encounters Mi-jin, who struggles because of the additional tasks assigned to Im Sun. Ji-ung provides Mi-jin with self-defense equipment, informs her about the killer, and saves his phone number in her speed dial for urgent situations.
It is later uncovered that he also placed a hidden GPS tracker on her cell phone. Mi-jin is undoubtedly infatuated with Ji-ung. In another location, Byung-duk manages to obtain information that reveals the source of all the Fentanyl in the city as coming from a luxurious club. They choose to disguise themselves, and Im Sun requests to participate. At first hesitant, they agree to let her come along, once more impressed by her understanding of clubs.
Prior to the surgery starting, Im Sun stops by Da-young’s room and requests for her to apply her makeup. The team’s operation begins when there are only three minutes left until sunset. In the line before the bouncer, Sun waits while the old woman catches their attention. Just as they were going to oust her, Im Sun changes into Mi-jin, astonishing them and quickly getting into the club. At the same time, Byung-duk is expelled.
After entering the establishment, Mi-jin captures the interest of the staff, who escort her to the VIP lounge. In a flashback, it is revealed she must gather proof of Fentanyl in the VIP area, where the club conducts drug business.
She comes in but gets into a difficult situation when one of the guests uncovers her secret camera. Simultaneously, Ji-ung barges into the club after being unable to reach Im Sun for over 10 minutes. As the guest is attacking Mi-jin with a glass bowl, he appears to be opening the VIP door at the same time.
This episode was hilarious especially the part where they were testing Lim sum. It is very interesting and the episodes are only getting better.