Ji-O has a special power and a secret, but he doesn't know who he really is. He is chased by mysterious figures, while he tries to find answers to numerous questions that surround him. Goo-Reum is a detective. When she decides on a course of action, she won't change no matter what. Her parents disappeared when she was only a young child. Goo-Reum chases after the truth behind her parents' disappearance. She meets Ji-O and her life changes.

Kim Rae-won, Lee Da-hee, Kim Sung-oh, Kim Sang-ho, Jin Kyung, Park Hyeok-kwon, Ahn Nae-sang, Jeong Da-eun, Han Kyu-won, Kim Min-gwi, Go Jin-Soo, Moon Jung-dae, Lee Joong-ok, Ahn Chang-hwan, Lee Hae-yeong, Hwang Jae-yeol