Zi O remembers that he burned down the orphanage as a child and is in a state of shock. Gu Reum takes him to Jong Hwan where he undergoes tests to find out about himself. However, Zi O recalls more horrific memories while tested.
In order to protect Gu Reum, Zi O takes her to a ranch where he used to work years ago. As the two spend their days together, Zi O enjoys the happiness of a normal person for the first time in his life.
Gu Reum brings Zi O home since he has nowhere else to go or anyone to depend on. There, Zi O comes to understand just how desperate and lonely Gu Reum has been while searching for her parents.
Gu Reum and Zi O are reunited in the fiery mess of Human Tech's secret lab. Gu Reum tries to stop him, but Zi O loses control while fighting Lee Son. Zi O takes Gu Reum to the hospital, blaming himself for hurting her again.
Zi O wakes up from losing his consciousness and has no clue where he is. In fact, he isn't sure who he is either. He just knows that he has a body covered in wounds and there are fallen people all around him.
Zi O returns to the lab where he lived as a child. An unexpected someone comes to meet Zi O and tells him a shocking truth. Meanwhile, Gu Reum finds a new lead on her search for her parents and continues her investigation.
Zi O gets admitted to the ICU after suffering extensive injuries from the fall. Gu Reum also ends up in the hospital where she suddenly remembers seeing Zi O during her childhood. Feeling confused, she starts to look into Zi O's identity.
Zi O takes Gu Reum somewhere safe to heal her injuries. Gu Reum asks Zi O questions about her parents, but he doesn't remember anything about them. Gu Reum takes him to a church to help him regain his memories.
Zi O feels a sense of emptiness as the cult followers cheer for him, believing that he is an angel from above. He then decides to cross the line, for Gu Reum and their child's sake. Gu Reum tries to stop him, and they keep disagreeing.
Zi O falls into despair when his only friend, Won Yi, faces danger because of him. He becomes more desperate to find Gu Reum and their baby and makes riskier moves.