#1 | 07.01.2015Episode 1 (I don’t even know yet…how many persons are there living inside me.)
Cha Do-hyun is in line to be the successor of Seungjin Group. No one in his family is aware that he's been suffering from dissociative identity disorder for years following a family tragedy. Oh Ri-jin is a first-year psychiatric student who runs into one of Do-hyun's many personalities while looking for one of her patients.
#2 | 08.01.2015Episode 2 (You can never forget my different eyes!)
Falling in love at first sight with Ri-jin, Se-ki vows to get rid of his host Do-hyun. Do-hyun looks for ways to make sure to keep his various personalities in check while he assimilates to life in Korea again.
#3 | 14.01.2015Episode 3 (If Se-gi approached Oh Ri-jin with the intention of getting rid of me…)
Do-hyun feels guilty when he finds out that he inadvertently put Ri-jin in danger because one of his alter egos. Ri-jin figures out the truth of his condition and sympathizes with him.
#4 | 15.01.2015Episode 4 (Just continue living like that, as if you’re not there.)
Considering his instability a risk to himself and others, Do-hyun declines treatment and withdraws from people and work. Seungjin Group harbors a deep family secret kept hidden from Do-hyun, who also discovers a new personality has emerged.
#5 | 21.01.2015Episode 5 (Try to recall, what happened between you and that lady)
Unable to tell Do-hyun and his other personalities apart, Ri-jin gets confused about who she's beginning to have feelings for. Do-hyun is warned that Se-ki's personality is growing stronger.
#6 | 22.01.2015Episode 6 (Who are you?)
Determined to keep Se-ki from taking over his life, Do-hyun asks Ri-jin to become his personal doctor. ID Enter is determined to track down Writer Omega's identity and works.
#7 | 28.01.2015Episode 7 (If you want to save me so badly, then you shouldn’t be late.)
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.
#8 | 29.01.2015Episode 8 (You must not lose Yo-na at any cost!)
Ri-jin discovers a new personality in Do-hyun when he learns about one of Omega's stories. Chae-yeon begins to feel jealous that Do-hyun might like Ri-jin.
#9 | 04.02.2015Episode 9 (Turning the fate into destiny..that’s my third mistake.)
Ri-jin encounters virtually all of Do-hyun's personalities in one night. Do-hyun makes a shocking revelation when he finally finds out who Writer Omega truly is.
#10 | 05.02.2015Episode 10 (The memory that only you can remember..am I there inside it?)
Se-ki grows angry when he discovers that Ri-jin has been spending time with Do-hyun. Ri-jin grows worried when she's told that Do-hyun may never return to recover his forgotten memories.
#11 | 11.02.2015Episode 11 (Show me and persuade me with your charms.)
Ri-jin encourages Se-ki to share the painful childhood memory with Do-hyun, and discovers what Ri-ohn has been hiding in his room.
#12 | 12.02.2015Episode 12 (If you did it, then I will do it too. Because you’ll become me soon!)
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.
#13 | 18.02.2015Episode 13 (It’s Ahn Yo-na’s world from now on! Oppa~!)
Do-hyun vows to find the other mysterious child that was also at the Seungjin mansion when he was a boy. Ri-ohn is caught off-guard when the teenage girl personality Yo-na suddenly appears.
#14 | 19.02.2015Episode 14 (I’ll find out about everything that had happened!)
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.
#15 | 25.02.2015Episode 15 (Living the rest of my life to atone for the sin won’t be enough; you’re the person covered with the)
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.
#16 | 26.02.2015Episode 16 (I will remember this for a long time.)
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.
#17 | 04.03.2015Episode 17 (Please don’t hit Do-hyun!)
More memories of the past comes to light for Do-hyun and Ri-jin. Do-hyun confronts his grandmother about the fire that took place twenty-one years ago and learns who truly started the fire.
#18 | 05.03.2015Episode 18 (Let’s run away..first, from the terrifying memories.)
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.
#19 | 11.03.2015Episode 19 (Who would despise those two people the most?)
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.
#20 | 12.03.2015Episode 20 (Should we open the bag?)
Do-hyun bids farewell to all of his personalities with the help of a new personality, and finally confronts his family about the past.