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.

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.

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.

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.

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.