Because of some transfer arrangement and several complicated cases, AICIP Au Yeung Chung (Bobby Au Yeung) and CUSP Tsui Hay-yi (Joey Meng) become collaborating partners. The duo have mutual understanding. Sheung Siu (Jeannie Chan), daughter of a logistics company boss, hates Au Yeung Chung as she is certain that he has caused her family to break up.