This story is really well written. I pity Bum and Sangwoo so much. They become what they are because of the people around them. I really wish there's an alternative universe where both of them grew up in a loving environment.
This is actually frustrating. Both ml and mc are pushovers. It's ok if they're being pushed by eo, but no. They're bullied by others. It's understandable if they're weak, but they have powerss too! Why not use it to retaliate? ಥ_ಥ
So.. he's a double agent??