I think they fought and made up off screen. The screenwriter didn't show this because it's irrelevant to the story, since the focus of the show is Woo Youngwoo and the lives of attorneys. 

If you're gonna write a scenario on the confrontation, how would it be?

 BlessingMixture:

The screenwriter didn’t show it because junho has no way of knowing that the post was from minwoo. it was just office gossip for some time

Oh yeah. I forgot that Suyeon only knew about Minwoo’s beef because Minwoo talked about it with her. And Minwoo is not being obvious that he didn’t like Youngwoo. 

Thank you for that clarification, chingu!