As a Principal Officer in the Hong Kong Correctional Services Department (CSD) working at Stanley Prison, Yung Chun Wai (Kenny Wong) has learned over the years to live his life cautiously. Life, however, never goes the way one wants it to, & Chun Wai is beset with more than a few problems. His subordinate, Kiu Ching Kiu (Vincent Wong), has proven to be a rebellious charge. He frequently butts heads with Chun Wai & even develops a romantic relationship with inmate Ting Ho Ho (Josie Ho). Chun Wai himself isnt immune to love-related problems. Weighed down by a failed marriage & a myriad of responsibilities, he feels hes unable to reciprocate the feelings of young correctional officer Yiu Ngoi Ka (Kate Tsui). Most crucially, on top of personal issues, the officers of CSD must struggle to stay afloat in the volatile & dangerous environment in which they work.