Honestly, I think he has some kind of mental issues or something, when he was little he couldn't feel pain or probably even some emotions, but somehow felt something when he saw mo's crying face when they were little, and without understanding what he was feeling he resorted to abuse to satisfy his curiosity(?) and obsession, because dude was obsessed.
At this point I feel pity for him, but it's beyond the point of redemption. I don't want to be ever near the group again, nor for them to forgive and accept them. She Li deserves to find a new found family, but not in Mo's group. He deserves therapy, but away from Mo.
I agree with you on that one.
No but honestly what is up with She Li? He's so weird.