Hong Il Tak, the bottom of Daemun Boy's High School, must survive by befriending the strongest guy.

A man who used to be called Lighter cleans up his act from his days as a gangster and struggles to start over.

Bound by a debt, an illegitimate son moves in with his aloof cousin, unaware that their uneasy deal will spiral into a deep and dangerous obsession.

Three friends, who majored in filmmaking in college together, decide to meet at a restaurant they used to frequent in front of their school. However, one of them doesn’t show up, while another friend, who happens to see the others, decides to join instead. There clearly is the air of discomfort around them, though.

The series tells the story of Oh Ha-rin, who travels to the past through mysterious photos left by her first love, Ji Seo-jun. Since they were eight years old, they had been close friends, but he died by suicide on her birthday ten years ago.