
Daddy is the leader of gang and mommy took her baby Jian Yi, away to keep him safe. He tian knows this because his daddy and brother are ether in the same gang or some kind of family to him. That's why he tian got even with momo for messing with him. Momo family problems also have to do with the same gang. He tian feels bad for him and likes momo so that why he does the jobs and picks and protects him. Maybe he tian uncle is Juan yi's daddy. Zheng Xi however is just a bff who is starting to fall for him.
Yay I was right about them being in the same gang.