Zi O awakens, disoriented, with no memory or sense of location. Amidst fallen figures, he discovers his own injured body, his identity a mystery.

Zi O takes Gu Reum to a safe place for her recovery. When she asks about her parents, he can't recall. To help jog his memory, Gu Reum brings him to a church.

Zi O remembers burning down the orphanage, shocking him. Gu Reum joins him for tests at Jong Hwan to uncover his past, leading to more chilling memories.

Gu Reum invites Zi O to her home, seeing he has nowhere else to go. While there, Zi O senses Gu Reum's loneliness and despair as she searches for her parents.

ZiO revisits his childhood lab, meeting someone who reveals a startling truth. Meanwhile, GuReum finds a fresh lead in her search for her parents and continues her investigation.