Ha Na and Doo Na were twin sisters who were very close to each other until Doo Na died a terrible death. One day, the usually bright and energetic Ha Na finds herself changing. She has superhuman strength and can do things that nobody can. Ha Na realizes that Doo Na's spirit has inhabited her body. Shin Ryu, a criminal psychoanalyst, uses Ha Na's powers to kill people that cannot be punished by the law.
as Shin Ryu
as young Shin Ryu
as Yoon Ha-na
as Ha-na (young)
as Yoon Doo Na
as Shin So-yi
as Ha-na and Doo-na's mother
as Baek Do-shik
as Baek Joong-chan
as Seo Joon-hee
as young Kim Yoon-oh
as Lee Hye-won
as Nurse
