Let's just respect how the author wants her manhwa done instead of complaining about its side couples. Creating character developments and the story itself takes time, if she were to draw what readers' wish, focus on only one couple might as well finish the comic now. No development and she wouldnt be called the author anymore just an amazing artist drawing what everyone wishes. Side couples helps author get more stories for their main couples. Let's just enjoy the manhwa everyone.
I've been reading this since 2015 and it's one of those slow burn romances I'm completely satisfied with.