The episode opens with Seol yoon handing over the diary given to him by Soo-hyun, to the real survivor of the fire incident- Kwon Min-hyuk. Kwon Min Hyuk is angry over the diary asking if he has anything to do with the woman who caused the fire but Kwon Min hyuk simply tells him they are both alike
Soon, Seol yoon’s real identity as the son of the man Soo-hyun murdered is revealed with a flashback of how his life went downhill after the incident. From having people trying to ruin his father’s funeral to being bullied in school, Seol yoon faced it all.
Now, he spends each day getting his revenge on the woman who ruined the mother-son duo’s lives with the hope that his mother will wake up one day. Meanwhile, Soo-hyun is surrounded by doubts of her own after meeting with the psychiatrist who gave her Seol yoon’s contact and asks her about the diary she never mentioned. She’s suspicious of her true intentions.
Later, she recollects how Seol yoon seemed to have no problem when facing fire nor did he have any marks on his back. She starts researching on her own while Seol yoon’s friend is seen taking care of Eun-min after which she runs into Tae-ho. The two seem to be getting along and she seems friendly. But it is soon revealed to be a part of Seol yoon’s plan.
Elsewhere, Seol yoon is following Su-ho while the latter is meeting with a friend who tells him about Seol yoon. He tells Su-ho that it was Seol yoon who found clues that cleared Kim Joon’s path to making it to the top. This intrigues Su-ho and he asks to get more information about this person, doubting that he is the one who sent the pictures to Soo-hyun and her mother.
However, he is unaware that Seol yoon is behind something different and has been laying his trap for a very long time. On the other hand, Seol yoon clears Min-hyuk’s debts and asks him to lead a better life while Soo-hyun visits Min-hyuk’s parents’ graves and realises the trap behind her first meeting with Seol yoon. He had actually set things up so that they could meet.
Suddenly, she gets a call from Seol yoon who subtly hints that he is at her mother’s restaurant while calling her out for lunch. However, Soo-hyun tries to keep calm and understand the reason why he is like this. Meanwhile, Kim Joon is working hard towards the elections and tries to get Su-ho to team up with him.
However, Su-ho is ready to bring him down and keeps his eyes open to Kim Joon’s downfall. Right as he is leaving his meeting with Kim Joon, he spots Seol yoon. There, another flashback shows Kim Joon helping the mother-son duo after the incident and is now trying to get Seol yoon back to med school.
He then promises to bring justice to the duo upon his entry into the Blue House after which the meeting ends. Later, Soo-hyun drops Seol yoon a visit at his workplace and tries to get a reaction from him by mentioning her mother’s restaurant, the fire incident victim’s graves, and so on, but gets nothing.
Later, she notices Yu-ri and Su-ho’s awkwardness when facing each other during a family dinner. They excuse their behavior as Yuri feeling awkward after confronting Su ho about his cheating. But the more Soo-hyun thinks and observes this exchange, the more things seem suspicious.
The scene changes to Seol yoon’s friend thanking the psychiatrist for helping lure Soo-hyun. Meanwhile, Soo-hyun is looking into the jaywalking incident herself and finds out that Eun-bin’s son had been a medical student. She soon gets more information about this student from Tae-ho and comes to a conclusion that shakes her. She soon contacts Seol yoon and asks to meet him.
Elsewhere, Seol yoon prepares to meet Soo-hyun, not as the person she knew but as the one who was most hurt by her. As the intricate trap set for Soo-hyun by Seol yoon is revealed, he finally comes face-to-face with Soo-hyun as Gwon Seol yoon, Eun bin’s son.
The episode ends