Yeah, I agree to some degree, but as FanbyunKim stated, it's not like he was missleading Namwoo AND he gave him a chance to leave (which was pretty da** lame without much of an explanation, but yeah, he thought he was doing him a favor). And honestly, how can you communicate something if you yourself don't know it? But yeah, he's old enough to recognize his mental draw-backs to get himself some much needed psychiatric help. Or maybe he doesn't know that's something like that could be improved with therapy, since talking about mental health and treatment is still quite the "taboo" topic, especially in home environment. And eventho he saw his moms mental health deteriorating, he never saw her or heard her talking about getting professional help. Who knows what's up for real, they are both contradicting themselves a bit, since Namwoo is yearning for love and ironically he seeks it from someone who apparently can't give him the only thing he wants. And Sieon says he can't love, but you can clearly see him being conflicted with how to proceed in this relationship, because he obviously cares for Namwoo, but doesn't want to repeat the same mistake again, where he would just let his partners leave without resistance.