The long-time undercover, Leung Siu Tong (Michael Tse) luckily escaped from death last time. Two years ago, he had received special training in learning to becoming a mute. With this, he entered into an illegal armed weaponry organisation for the purpose of collecting massive evidence and info. And eventually, he successfully captured them who were from such illegal armed weaponry organisation. He was pursuing in becoming a cop undercover instructor. However, he was unable to adapt in living such disciplinary life in the cop field. And indeed, he decided to become an undercover once again. He met Jodie Chow Mong Ching (Fala Chen) who was his superior and his liasion. Ching was looking like Tong's ex-girlfriend in terms of her cool characteristics. One female cop and one undercover. It seems they had a black-white conflicting relationship, wondering whether they can be together in the end.
In achieving promotion fast, he approached a genius enterpriser, Michael So Sing Pak (Bosco Wong). Pak was leading and managing a gangsterism group which he wanted to enterprising as on par with other organisations. Pak was nurturing and supporting his childhood friend, Paris Yiu Ho Ho (Kate Tsui) in becoming a barrister. Ho thought that she was in love with Pak, and hoping that she would not help Pak in dealing with matters relating to gangsterism. Both of them encountered multiple love, betrayal, separation. Both selfish persons were doubting when one will be betrayed by the other, when it was the most fearsome of all.
The limitless and determined Tong and the smart and confident Pak, they are battling with each other. They are brothers on the surface, but in fact they are doing something on different purpose, and they are forthputting one another.