Senior correctional services officer Man Sheung Sing (Lawrence Ng) is in charge of supervising and disciplining the inmates at the Stanley Prison. Having to confront unruly prisoners every day, Sheung Sing takes each step of his life cautiously. Adding more stress to his job, his subordinate Kiu Ching Kiu (Vincent Wong 王浩信) often violates regulations and even goes as far as starting a romance with a prisoner. Stationed at the Lo Wu Correctional Institution, officer Yiu Ka Oi (Kate Tsui) confesses her love to Sheung Sing. Ka Oi is more than ten years younger than Sheung Sing and has known him for many years. Sheung Sing rejects her out of fear that their relationship will fail like his last marriage. Sheung Sing’s good friend and colleague Yung Wai Jun (Kenny Wong 黃德斌) can tell that Sheung Sing is afraid to fall in love with again. Like Sheung Sing, Wai Jun also faces trouble at home. Fortunately, Sheung Sing’s ex-wife Yip Nga Lui (Jade Leung 梁琤) and colleague Chi Chun Gwong (Tracy Chu 朱千雪) are there to support him. The officers at the Stanley Prison are faced with new challenges every day, twists and turns that are too convoluted for outsiders to comprehend. After the events of a large uproar in prison, Sheung Sing and his colleagues come across a life-threatening situation. Will they be able to save themselves and complete their mission?