The ruthless Fong Chi Lik suffers from congestive heart failure, and was fortunate to have good-hearted Yiu Yat San donate his heart to him. After the change of heart surgery, this evil man's personality changed drastically. When he recovered, he suddenly turned into a nice man. When Lik discovered Yat's "accidental" death involved him and his wife, he gets lost between love and righteousness; good and evil. Yat's younger brother Yiu Yuet San gets involved in a wrong and complicated relationship with his brother's girlfriend Yuen Siu Kat. Kat also develops a controversial relationship with Lik, which caused turbulence with her boyfriend.