Jungkook has to solve a new murder case. Taehyung is the victim's older, and very much Catholic, brother.  Cue a lot of tension, some ty humour and a whole bunch of repressed emotions. 

Hara's new stepbrother, Jungkook, thinks she's a gold digger.  Hara is just waiting for her 18th birthday so she can haul without child protection services hunting her down. 

 Is that Jung Hoseok drunken caroling outside of my window at 2 am?