
I am sure of that, on both Sohwa and Sohwa's father. I think that dark haired boy was used by the father and maybe Sohwa and that boy wants to get them back.
But the guy executing the plan for him (can't recall either of their names) definitely has a soft spot for things/people that are hurt. He seems to be doing this for the dark haired boy's sake, but he disdains his father's business and isn't involved in it.
I don't doubt he is capable of hurting Miha, but I get the feeling that it could change because what the other boy has been through weights on him heavily.

I think Sohwa is in for a harsh realization.
He is expecting Miha to come back to him because he always does but that will be out of Miha's control since he has essentially been kidnapped. I think Miha wants to leave this but that toxic relationship with his brother has become a drug he is going to need help detoxing from.
And the bigger boy would keep him away from Sohwa for the dark haired boy's plans but also for Miha's sake.
Rihan may be the only link to tie that boy to Miha but he keep quiet to also save Miha and give a lesson to Sohwa.
I think Sohwa's father (I refuse to see him as Miha's dad) will intensify the search for Miha as Sohwa starts to get desperate and deranged over Miha's loss. When Miha doesn't return and when Sohwa decides to look for him and then not find him, that's when he will evaluate his actions and feel massive pain over his loss. That's when he will value Miha.
Sohwa loves Miha in a possessive, all encompassing way but he sees him as someone that belongs to him (because that way it would be easier to have him) so in his mind he doesn't have to try to treat Miha well. To him, Miha just wants him. So he humiliates him and feels resentment towards him (Sohwa doesn't know that Miha loves him, how could he?).
So because Sohwa loves him and Miha "doesn't" but Sohwa is good enough to sleep with him that makes Miha trash. It isn't just his dad's conditioning.

Definitely.
But supposedly they still don't know who stabbed Sohwa that happened more than 3 months ago from the current story line. And I also think that Miha not coming in within a few days would be enough to push Sohwa off.
I really think that Miha is too hurt, too frail and too in love with Sohwa not to try to hurt himself. If he isn't found before he were to hurt himself, I think that would drive that guy to let him go.
Spoilers included
So wait...Did Sohwa just get his memory of how he felt for Miha before the memory lost and nothing else? He still doesn't recognized Rihan and sees him as an adversary.
And who gets the vibes that despite his attachment to that dark haired damaged boy, the guy that's trying to take Miha might start to care for him at some level. I am not saying he isn't capable of harming Miha, especially since he is loyal to that dark haired boy. But I do think he has a soft spot towards people like Miha that have been through a great deal of abuse, just like that boy he loves.