Twenty years ago, young mother Elisa (Hannah Chan) committed manslaughter; twenty years later, the orphaned Di Shi (David Tao) was also arrested for drug possession. After arresting Di Shi, detective Lam Lik Fai (Cheng Chung Kei) recalled a couple murder case he had handled more than ten years ago - Di Shi was Elisa's orphan. Apart from regret, what else can Lam Lik Fai do? ©Hong Kong Film (Yi Ai)