Cha Dohyeon is a rich heir to a family company with one major problem. Due to suppressed childhood trauma, he suffers from dissociative identity disorder manifested in seven unique personalities who are out of his control. In order to overcome this disorder in secret, he hires a first-year medical resident to help him heal by killing off each personality one by one.

• Ji Sung
• Hwang Jung-eum
• Park Seo-jun
• Kim Yoo-ri
• Oh Min-suk
• Kim Yeong-ae
• Shim Hye-jin
• Kim Yong-geon