
The best ending to this story would be when in the end they all go their own ways and no one dates anyone xD
They just don't match

Best ending is Minho to end with the guy he loves.
Minho clearly is fighting for the man he loves at this point, without any dirty tricks, as opposed to the shady fella Pinkie that cannot be trusted.
Minho would never go out with someone like Pinkie that doesn't care about using someone to get what he wants. He knows Hajun doesn't like him yet but he is sincere and honest. That's where they match.
Minho and Hajun just need some time to bond without that creepy Sunbae sabotaging the flow.

The older I get get the more stupid manga seems to me

trying taking a break from it all - between 1 week to 1 month
find something else , take up a new hobby, read a novel or comics or fanfiction, watch korean or japanese or thai dramas, get into a new fandom, watch variety shows or game shows to laugh, do an activity that has you be outside for approx. 1/2 an hour, play games (video, board, puzzle, app, group, computer, handheld, etc) , try creating something of your own
hope this helps
Did the author forgot about the initial pairing? It gets so little attention!