Ri Jin discovers that her own childhood memories are emerging in the pursuit to recover Do Hyun's memories. Do Hyun finds out the truth of what happened in that basement during his childhood days.
Do Hyun's personalities appear over the course of one night when he learns the entire truth. However, a past threat appears to break his resolve once more.
Do Hyun finally recovers a crucial piece of his forgotten memories, and is now determined to become stronger and bear the burden. Chae Yeon is conflicted about her upcoming engagement to Ki Joon.
Rattled by the truth of the memories he shares with Ri Jin, Do Hyun is committed to living the rest of his life in repentance. Ri Ohn asks Do Hyun to step in so that Ri Jin doesn't recall her childhood memories.
Do Hyun and Ri Jin embark on a trip together before their contract is terminated. As Ri Jin starts to recall more of her past, the memories bring with it deeply-buried pains, and most importantly, the truth.
Ri Jin and Do Hyun embark on their cathartic journey to deal with their shared painful memories. But just as they begin, another personality shows up to threaten their progress.
After getting through a life-threatening situation with Ahn Yo Seob, Ri Jin is left with the decision to either leave for America or become Do Hyun's doctor. Ki Joon tries to look into why his cousin sees a psychiatrist.
Do Hyun vows to find the other mysterious child that was also at the Seung Jin mansion when he was a boy. Ri Ohn is caught off-guard when the teenage girl personality Yo Na suddenly appears.