Mysterious fire accidents suddenly happened in Seoul. The felon of this tragedy was still unknown and police couldn't find any clue or trails of the bad guy. Seunghyun, a 26-year-old guy, couldn't help but to worry about it. One night, when he went to a mini market near his apartment, he met this weird girl instead, who was likely homeless. Day by day, Seunghyun was even more curious about the girl and kept finding reasons to meet her in order to find out more about this full-of-mystery girl. But little did he know...