Responses
I’m gonna assume that he wasn’t messing around with others, just going based on what he said in the later chapter and also from the fact that his main objective was to protect beom anyway he could even though they couldn’t be together during that time… once again just going based on what we all know so far and my own assumptions and hopeful thinking! :)

So based on chapter 39 is the top ML a playboy or not? He said he wasn't a playboy. It was a misunderstanding.
Did he date others?
Because based on everything so far he was pretty obsessed with the bottom ML.