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