Ruse of Engagement

Widow Tong Suk Fan is saddled with hardship alone, struggling to bring up her two sons Chong Yau Ching and Chong Yau Kit. The brothers join the Intelligence Unit and the Operations Unit of the Anti-Terrorist Force, respectively, and both gain recognition from their superior, Shum Chi Ngo, which is supposed to be a comfort to their mother. Unexpectedly, their brotherhood is turned to enmity owing to intelligence.
Through a reliable source from journalist Yip Ting, Yau Ching probes into a secret organization, during which he nearly gets himself killed and cannot resume duty immediately. After seeking aid from his girlfriend Chung Yat Ka, who accesses the database in secret by leveraging her duty as the intelligence analyst, he uncovers that there is a mole in the intelligence agency. His younger brother Yau Kit not only suspects him of being a traitor but also takes advantage of his absence to court Yat Ka.
Just as Yau Ching is caught helplessly in a dilemma, fortunately, he gets help from Yip Ting, and the two gradually develop romantic feelings for each other. However, in an attempt to ferret out the culprit, Yau Ching does not hesitate to use himself as the bait, walking to the path of no return. Long gone seems to be the days when fidelity, love, and righteousness still mattered to him.
(Source: Dramanice)