In this fifth season of the police thriller, the action turns towards the sea. Wang Man Ting (Rebecca Lim), the officer-in-charge of the Coastal Patrol, watches over the border security. An efficient but tough leader, she crushes many smuggling cases in her career. A new batch of recruit joins her team, but not understanding her leadership style, they often clash. Will she be able to gain their allegiance with her no-nonsense approach?

Man Ting suffered trauma when she was young, she meets Jia Ming (Weber Yang) and realises he was her childhood savior. But Jia Ming hides an ulterior motive, a member of an elusive human and arms smuggling ring, he gets near Man Ting to get intelligence. As fate would have it, both develops feelings for each other. But with both of them standing at the opposite ends of the law, how will they decide?