One is the little junior brother who is doted on, and the other is the senior brother who is let go.
At the end of the novel, the upright elder brother stabbed the younger junior brother to death for Tian Xingdao.
Su Mo said it was all the fault of the master who couldn't raise a baby and died young.
Then, the system asked Su Mo to take care of the child.
Su Mo said that for people's teachers, that's not a problem.
Just when Su Mo was busy educating his junior brother, another one became crooked.