Synopsis：Dongzi, an undercover cop determined to crack a major drug case, is ordered to infiltrate the gang led by Boss Dog, who is yearning for retirement, and thus begins a bloody and dangerous undercover mission with success. This confrontation between police and gangsters is not all hostile—gangster "Old Dog" and undercover "Dongzi" are both similarly lonely and unsettled souls. In a "righteous deception," they put their absolute trust in each other, resisting in a helpless and desperate fight for love. Eventually, the troubled Boss Dog and Dongzi fulfill their respective destiny.