He hot but DAMN! if the author will make this a love triangle, I'm gonna drop ts.

I doubt it’s gonna be a love triangle. Based on ideum’s reaction and the fact he can just say “you’re handsome” as a matter of fact (with Jaeyi he acts so flustered and can’t even form a sentence without stumbling and going red), the guy was most likely inserted by the manhwa’s author as a way to make Jaeyi and ideum get closer and admit jealousy / feelings for each other. Ideum has no interest in this guy fosho lol