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Fresh-faced police officers Cheung King-san (Owen Cheung), San Hoi-ching (Sisley Choy), Ho Si-wa (Gloria Tang) and Wu Kwun-chung (Brian Chu) apply to join Airport Security Unit (ASU) due to different reasons. The quartet manage to survive drillmaster Man Wing-keung’s (Eddie Kwan) boot camp and become ASU officers after graduation. King-san and ASU CIP Cheung Chun-hak (Hugo Wong) just keep antagonizing each other. Sergeant Ma Yung-yi (Mat Yeung) often plays the role of mediator between the duo as he understands they cannot stand each other. King-san encounters air hostess Yu On-na (Roxanne Tong). They readily become lovers, but they have trouble getting along. King-san gradually has some kind of subtle feelings for his female colleague Hoi-ching. While on duty, they witness scenes of joy, sadness, reunion and separation. They also get involved in near-death situations. They eventually understand the true meaning of the mission of ASU. However, disaster is looming, causing the team to become embroiled in an unprecedented predicament.

年輕警員張景山(張振朗飾)、辛凱晴(蔡思貝飾)、何詩嬅(鄧佩儀飾)、鄔冠聰(朱敏瀚飾)為着不同原因，報考機場特警。在教官文永強(關禮傑飾)的嚴厲指導下，四人達標畢業，加入機場特警組。景山卻經常與特警組總督察章振赫(黃子恆飾)對着幹，警長馬容義(楊明飾)深知他們的嫌隙，不時居中緩解。景山意外遇上空姐余安娜(湯洛雯飾)，二人相戀容易相處難，景山反而漸對女拍檔凱晴產生微妙感覺。各人於執勤時盡見悲歡離合，徘徊生死，逐步確立身為機場特警的使命感！然而，巨大危機正悄悄逼近，令團隊陷入前所未有的困境……