After the success of the smart patch "Hatch" presentation, Jaehyun gets touted as the presidential candidate; his wife Taera regains her lost memory; Taera and her neighbor, Haesoo, pursue an unsolved case from fifteen years ago.

Taera struggles to accept the truth about the murder she committed in her past; chaos ensues at Hatch as super chimpanzee Red gets killed; the three friends of Hatch start their investigation.

Jaehyun declares his candidacy for president; Kim Seonduck finally appears; Taera gets thrown into a commotion from her past and present; worried about Taera not acting like herself, Jaehyun hires a bodyguard.

Haesoo cannot accept that Taera is the killer; Taera confronts Kim Seonduck and chases the person who manipulated her life.

Yura is found dead and Dojin, who had an affair with Yura, becomes a prime suspect.

Haesoo reveals Taera's identity on the talk show; Sungchan finds an unexpected item and becomes Taera's ally; Dojin realizes Haesoo's true feelings and decides to believe her; he starts uncovering Taera's past.