If he weren't so aloof as to only care about sleeping in the back row, perhaps subsequently… things wouldn't have ended with that female classmate jumping off the building.
Fu Tianci didn't know if it was his guilt at work or if it was because those drops of blood on his white skateboard shoes had dripped their way into his heart and awakened some of that sense of justice in him from his junior high days…
Then later, when he discovered that this female classmate called Chen Xiaotang was being bullied, Fu Tianci couldn't hold himself back.
The same thing happened—Qiao Yihang had failed in his confession, so he deliberately smeared Chen Xiaotang at school, using the same tactic of rounding up the others to bully her.