I'm hoping to see a clear relationship chart. I know Jung Ha and Park Bo Gum's character are the endgame, but is there a clarification on Byun Woo Seok's character - Hae Hyo?

Well, they did release one, but it's not exactly "clear" LOL - https://mydramalist.com/photos/18gpd_3

They didn't clarify the relationship between any of the other characters aside from the apparently *mutual* main & "second"? couples? which ironically does not include the "second lead".. hmm.. 

In tags for description of this show nothing says break up so clingy to this!