Lik-kei, Ho-fan and Chung-ying are evading the baddies. In an elevator, Lik-kei abruptly has breathing difficulties and collapses. After being pursued by assassin, Ho-fan keeps hiding in his room all day long. He is only willing to contact Lik-kei. Crime Unit tells Lik-kei to resume duty and protect Ho-fan. The duo are polar opposites and often get into hilarious situations. Ming-kwan is really scared as tough guy W wants him to settle his debt. To raise money, Ming-kwan uses some excuse for buying new machinery to embezzle company funds. But some document requires Ho-fan’s signature. Ho-fan refuses to sign as he notices some error on the document. Ming-kwan is frustrated. Lik-kei wants to track down the female accomplice mentioned by Ho-fan. He finds out Rising Apparel Limited has exactly lost the key date’s CCTV footage.
Because of a fatal shooting case, plain-clothes Sergeant Ko Lik-kei runs into a “dull” and “troublesome” witness called Lee Ho-fan. Lik-kei is instructed to protect Ho-fan at all times. Initially, the duo are strangers that cannot stand each other. They then gradually get along. Meanwhile, an apparel company of which Ho-fan is a major shareholder is found to have involved in illicit dealings. Yip Cheung-lok and his son Yip Ming-kwan, who are member of senior management, are associated with these activities. Lik-kei teams up with Ho-fan and Ho-fan’s younger sister Lee Chung-ying, who is a barrister by profession, to investigate. Lik-kei and Chung-ying get entangled in a relationship in the process. Also, Lik-kei’s elder sister Ko Wing-yumand Ho-fan get along sometimes and provoke each other at other times. Fate has brought the foursome together, causing a case that has remained unsolved for more than twenty years to be reopened.
