Director: Jack Lai, Ng Yuen-Fai

Cast: Louis Koo, Raymond Lam Fung, Bai Baihe, Jessica Hsuan, Sonija Kwok Sin-Nae

Back To The Past is a 2025 Hong Kong action-comedy science fiction film co-directed by Jack Lai and Ng Yuen-Fai, starring Louis Koo and Raymond Lam Fung. Set across the ancient Qin Dynasty and a technologically advanced future, it blends time-travel spectacle with a layered showdown between a master and his former student who now rules an empire.

What is Back To The Past about?

Twenty years ago, a time-traveller named Hong Siu-lung slipped away from history and settled quietly with his family deep in Qin territory, hoping to be forgotten. The Qin Emperor — his one-time protégé, now the conqueror of six warring states — has never stopped watching him from the shadows. Just as the emperor stands at the threshold of absolute dominion, a squad of intruders armed with weapons that belong to another century disrupts everything. The intrusion drags Hong and the emperor out of their long standoff, forcing them to reckon with a shared history neither has fully resolved. Whatever happened between master and student will determine whether the future survives at all.

Cast & crew

Louis Koo leads as the weary time-stranded Hong Siu-lung, bringing the screen charisma that has made him one of Hong Kong cinema's most bankable stars for three decades. Raymond Lam Fung faces him as the ruthless emperor. The supporting ensemble includes Bai Baihe, Jessica Hsuan, Sonija Kwok Sin-Nae, Joyce Tang Lai-Ming, Michael Miu Kiu-Wai, and Louis Cheung — a roster that reads like a Hong Kong pop-culture reunion spanning multiple generations of fans.

Context & significance

Hong Kong time-travel comedies have long carried a special affection among Persian-speaking diaspora viewers who grew up watching Cantonese classics dubbed or subtitled in Persian during the 1990s and 2000s. Back To The Past taps that same vein: fast pacing, star-driven ensemble chemistry, and a premise that mixes historical China with genre spectacle. For viewers who want an entertaining, fast-moving film that does not demand cultural insider knowledge, a Hong Kong blockbuster set in imperial China crosses borders effortlessly. The film is available on K-Time with a full Persian dub, so you can follow every twist without needing to read subtitles — making it equally accessible on the big screen or a mobile device after a long day.

Where & how to watch

Back To The Past is available on K-Time with both a Persian dub and Persian subtitles. Stream it on your browser, Android TV, or phone — no VPN needed, no extra download, and no geo-blocking. Subscribe once and cancel anytime.