Xu Bing, who had been working with his little brother at the construction site, was annoyed because he had not received wages for completing Zhang Mingda's project. After staying at work for a period of time, he finally caught the opportunity. Zhang Mingda, who was a little powerful, kept begging for mercy after Xu Bing put a knife to his neck. Finally, the arrival of the police stopped Xu Bing who continued to intimidate Zhang Mingda, but Zhang Mingda, who was at the police station, not only did not embarrass Xu Bing, but only allowed Xu Bing to leave the police station after giving him a small punishment. When he left, he also asked Xu Bing to hand over his wages. Although it hurt physically, at least he did not embarrass himself too much. It was such a simple thing that made Xu Bing think that he owed Zhang Mingda a favor.