Shock Wave is a 2017 Hong Kong action film written and directed by Herman Yau, produced by and starring Andy Lau. Released on 20 April 2017 in Hong Kong and 28 April 2017 in China, the film is Yau and Lau's third collaboration as director and star respectively after 1991's Don't Fool Me and 1999's Fascination Amour.

In the film, the protagonist finds a door connecting two parallel and opposite worlds, World A and B. Everything the protagonist loses in World A can be found in World B. The unhappiness he encounters in World B can be comforted in World A. The protagonist travels through two worlds, enjoying both sides. But he is also physically and psychologically exhausted by the frequent traveling. Then one day, the door is about to vanish forever due to housing relocation. How will the protagonist choose between World A and B? Imperfect tells a bizarre story, using a "door" to compare the many choices buried in everyone's heart. The gain and loss, the right and wrong, the good and bad, everyone has to face and accept them at the end of it.