BTOB's Minhyuk, F.T. Island's Jonghun, Kim So Hye, and Park Ha Na have been cast in the lead roles. Minhyuk will be playing Bae Joon Young, a man who can read all women's thoughts after getting a heart transplant; Jonghun will be playing Min Soo Ho, who has super strength after a transplant of his own. Kim So Hye will be playing Lee Yoon Ji, who can see the future after getting a cornea transplant (she'll also be the romantic interest for the two male leads). Park Ha Na will be playing the coordinator Noh Deul Hee, who watches over all three.