1941. Hong Kong is under Japanese occupation. The anti-Japanese Dongjiang guerilla unit is tasked with rescuing cultural figures and extracting them from the besieged city. Primary school teacher, Fang Lan and her mother are trying to live out this difficult period in a small run-down flat in Wanchai. After the schools are shut down, Lan unwittingly finds herself involved in the guerillas' mission to save novelist Mao Dun. In the process, she meets Blackie Lau, the intrepid sharpshooter captain of the guerillas' Urban and Firearms unit. Taking notice of Lan's calm, smart nature, Blackie recruits her to join the guerillas. Worried for her daughter's safety, Lan's mother volunteers to take Lan's place as a courier, only to be arrested on the job. To save her mother, Lan is forced to turn to Wing, who now works for the Japanese.

The movie features three ghost stories set in Hong Kong, beginning with Vivian, who, after moving into a new place, gets involved in spooky incidents with her neighbours. The next story follows Scarlet, who unknowingly receives a tattoo with sinister secrets. The final story is about a group of university students, who awaken the vengeful spirits of a dead couple while live-streaming their ghost hunting expedition.

Amidst the sweeping cityscape of cosmopolitan Hong Kong, an ex-Marine falls in love with a ballerina from China. Against mounting cultural and religious pressure, the two star-crossed lovers risk it all in pursuit of true love.