Romance of the Three Kingdoms: Zhuge Liang shed tears and beheaded Ma Su. Ma Su put forward the strategy of "attacking the city for the top and attacking the city for the bottom" when Zhuge Liang put down the barbarians, which was adopted by Zhuge Liang, thus putting down the barbarians. Masu, a native of Pingnan, contributed a lot. This is work. Later, Zhuge Liang sent Ma Su to guard the street pavilion, but Ma Su stuck to his guns and refused to listen to Wang Ping's advice. As a result, Wei Jun defeated him and the street pavilion fell. Zhuge Liang beheaded Ma Su according to the military law, and the people begged, but Zhuge Liang said that his merits and demerits could not be offset, so he beheaded Ma Su.
Zhong Jing Yue Fei: In order to defeat Yue Fei, Jin Wushu tried to draw Yue Fei away from the mountain. When Yue Fei left, he ordered Fu Qing to guard the barracks and told Fu Qing not to send troops without military orders. After Jin Wushu knew it, he sent a military adviser Hamifan to pretend to be a refugee and lied to Yue Fei's wife that Yue Fei was trapped and asked her to go to the rescue. Yue Fei's wife believed it and went to the military camp to ask Fu Qing to send troops to save Yue Fei. Fu Qing was also worried about Yue Fei's safety, so he led a team of military forces to save Yue Fei. As a result, she was almost wiped out. Yue Fei came back to understand the situation. He wanted to behead Fu Qing for disobeying military orders and sending troops without authorization. People pleaded in succession, saying that Fu Qing had made many exploits before and spared his life. However, Yue Fei thought that merits and demerits could not be offset, and insisted on cutting Fu Qing. Later, Yue Fei's mother pleaded for Fu Qing, and Fu Cai was saved from death, but Yue Fei still hit him with a hundred sticks.
These are two examples where merits and demerits cannot be offset. I hope it helps you.