At the center of it all, of them all, was a boy named Mark.    

Mark is pregnant, but, with whose child? Jeno's or Renjun's? Lee Jeno and Lee Mark have been married for quite a long time. In fact, so long that Mark's done with Jeno. So done that Mark finds herself cheating on Jeno with a certain boy who's scared of basements, Renjun, Jeno's auntie's son.