At this point Youngwon should just tell him the truth. It would explain a lot even if any normal person would have difficulty believing it at first and he can kind of back himself up by all the stuff he knows, that he shouldn't be able to know otherwise. At least it might give Hohyun a reason to stay put instead of putting himself in any more danger than he has to be. But I guess, the author feels like we need the drama for the story to be more interesting.
At this point Youngwon should just tell him the truth. It would explain a lot even if any normal person would have difficulty believing it at first and he can kind of back himself up by all the stuff he knows, that he shouldn't be able to know otherwise. At least it might give Hohyun a reason to stay put instead of putting himself in any more danger than he has to be.
But I guess, the author feels like we need the drama for the story to be more interesting.