Park Chanmi's older brother, Park Chanyeol, was comatosed due to a car accident. A few hours after comatose, Chanyeol experiences Astral projection (soul travel) and guides Chanmi on her life. He introduced Chanmi to his bestfriend, Byun Baekhyun, who is a jerk according to Chanmi and Chanyeol asks Baekhyun to protect Chanmi whenever his soul gets back to his physical body.