Chen Nan could have maintained an aloof heart and stayed away from the world, but he was pulled out of the protective circle by an ignorant "child". He was tolerant but alienated, at once and at the same time distant, tolerated your behavior, compromised your decision, until he was confused and abandoned you, and he would eventually become the person he had passed away and get the retribution he deserved. Maybe this is what is called repaying grievance with grievance. This is very good.