Watch on SFlix. The Special Duties Unit (SDU) is an elite paramilitary tactical unit of the Hong Kong Police Force and is considered one of the world's finest in its role. But being the best carries its own burdens. Like everyone else, they go through troubles with love, with family and with their jobs. And sometimes they get horny. This touching story is about Special Duties Unit Team B and their trip to Macau for a weekend of unadulterated debauchery.