Tae-ra cannot believe she is No.50, the killer who shot Hae-soo's father fifteen years ago. Chaos ensues at Hatch as super chimpanzee Red gets killed. The three friends of Hatch start their investigation.
Jae-hyeon declares his candidacy for president, and Kim Seon-deok finally appears. Tae-ra gets thrown into commotion from her past and present. Worried about Tae-ra not acting like herself, Jae-hyeon hires a bodyguard.
Hae-soo cannot accept that Tae-ra is No.50, the killer who took her father's life. Tae-ra confronts Kim Seon-deok and chases the person who manipulated her life.
Yoo-ra is found dead, hanging on a tree struck by lightning. The townhouse turns upside down. Do-jin, who had an affair with Yoo-ra, becomes a prime suspect. Soon after, Hae-soo suggests Tae-ra appear on her talk show.
Hae-soo reveals Tae-ra's identity on the talk show. In the meantime, Sung-chan finds an unexpected item and becomes Tae-ra's ally. Do-jin realizes Hae-soo's true feelings and decides to believe her. He starts uncovering Tae-ra's past.
Tae-ra learns her bodyguard Pil-seung is her brother. She warns Kim Seon-deok, but Pil-seung's cold attitude only disheartens her. Kim Seon-deok starts trailing Jae-hyun, making him suspect the townhouse residents.
Pil-seung confesses to killing Chairman Song and assassinating President Ko Tae-sun fifteen years ago. As usual, Tae-ra tries to take the blame. Meanwhile, Do-jin's heart sinks when he learns about the shocking past of Jang Geun-mo, his father.
