The Baolian Lantern guarding the world was stolen. Yang Jian entered the mortal world to find the light and fell in love with a mortal woman. The two join forces to fight against the Chaos Demon who tried to subvert the six realms, and finally prevented the destruction of the Baolian Lantern.

Japanese imperialism launched the September 18th Incident in China, and the criminal guns and guns were stained with the blood of the Chinese people. Simultaneously with the armed aggression, a bacteriological unit code-named 731 was established along the Su-Manchu border. They inhumanly used the Chinese, Koreans, and Soviets to carry out brutal experiments on living bodies, and committed horrific brutality in concentration camps, occupied areas, and prisoner-of-war camps; massacres, perverted adultery and humiliation, poison gas and bacteria experiments , sex experiments, etc...

Lau (Tony Leung Chiu Wai) is a policeman who meets his true love (Korean actress Chiu Ngan Suk) in the emergency room of a hospital. He's being treated for severe wounds received in the line of duty, and she's being treated for an attempted suicide! But she dies, and Lau is unwilling to let her go. He pursues her case, leading to encounters with a variety of quirky individuals (including Tats Lau and Theresa Lee), and finally a freak time accident that transports the whole motley group to the era of the Three Kingdoms! Can he find a way to reclaim his love and make it back to the future?