Season 1
A traumatic childhood experience leaves Cha Do Hyun, suffering from memory loss and dissociation. The latter has resulted in the creation of seven distinct personalities. Wanting to regain control over his life, he asks Oh Ri Jin, a first-year psychiatric resident, to help him, but she eventually falls in love with one of his personalities. Ri Jin’s twin brother, Oh Ri On, a famous mystery novelist, investigates Do Hyun and his family.
Episodes
1. I don’t even know yet… how many persons are there living inside me.
Do Hyun realizes he has another side within him and recognizes that this is multiple personalities.
2. You can never forget my different eyes!
Even though Ri Jin is flustered by Do Hyun's complete change into Se Gi, Ri Jin rushes him to the hospital.
3. If Se Gi approached Oh Ri Jin with the intention of getting rid of me…
Perry Park rushes to the scene and saves the damsel in distress from Ahn Gook. Together, they flee the scene.
4. Just continue living like that, as if you’re not there.
Do Hyun's new personality emerges, and he's amazed that it's a young child.
5. Try to recall, what happened between you and that lady?
Remember what happened on that day. Se Gi, after capturing Ri Jin, asks her to put Do Hyun to sleep forever.
6. Who are you?
Do Hyun can't stop thinking of Ri Jin. Se Gi gets so jealous that he warns Do Hyun to stay away from Ri Jin.
7. If you want to save me so badly, then you shouldn’t be late.
Tae Im asks Chief Ahn why Do Hyun returned to Korea and Chief Ahn is left in a quandary.
8. You must not lose Yo Na at any cost!
Ki Joon proposes to Chae Yeon, but she's angered by his manner. Ri Jin agreed to be Do Hyun's secret doctor.
9. Turning the fate into destiny... that’s my third mistake.
My third mistake was my destiny. Ri Jin meets all of Do Hyun's personalities in one night.
10. The memory that only you can remember... am I there inside it?
Se Gi declares total war on Do Hyun and Jeon Myun while Ri Jin remains at the mercy of Se Gi.
11. Show me and persuade me with your charms.
Tae Im is shocked by seeing the video footage from Joon Pyo's hospital room and subsequently faints.
12. If you did it, then I will do it too. Because you’ll become me soon!
Do Hyun learns later what Se Gi has done and falls into despair. Chae Yeon is all the more shaken by Do Hyun.
13. It’s Ahn Yo Na’s world from now on! Oppa~!
Yo Na, Do Hyun's other personality, comes out and kisses Ri On on his cheek. Do Hyun finds Seo Yeon's photo.
14. I’ll find out about everything that had happened!
I'll find out what happened! Do Hyun spends a merry night with Ri Jin's family and regains his spirits.
15. Living the rest of my life to atone for the sin won’t be enough; you’re the person covered with the wounds.
Do Hyun begins recalling his lost memory and Ri On decides to look into who masterminded Ri Jin's kidnapping.
16. I will remember this for a long time.
I'll remember for a really long time. Do Hyun goes on a trip with Ri Jin on the winter train.
17. Please don’t hit Do Hyun!
Do Hyun and Ri Jin falls in shock as they remember the past. And Do Hyun learns about the fire accident.
18. Let’s run away..first, from the terrifying memories.
Let's run away from the terrifying memory. Ki Joon begins to collect all kinds of information about Do Hyun.
19. Who would despise those two people the most?
Ki Joon and Chae Yeon are surprised to learn that Do Hyun has multiple personality disorder.
20. Should we open the bag?
The hidden personality of Mr. X, along with Na Na, reflects Do Hyun's healing process.