Moonlight Express (1999) on Netflix

Plot summary

Hitomi, who lives in Japan, comes to Hong Kong to settle several important matters surrounding the death of her fiancé Tetsuya Misawa, killed years earlier in a car crash. During the visit she stumbles into Shek Karbo, an undercover police officer caught up in a drug bust that has turned against him and left him a fugitive. Karbo looks remarkably similar to Tetsuya, and the resemblance amazes her. The two find themselves having strong feelings for each other, and Hitomi stays with Karbo even as he has to flee to China because his situation has gone from bad to worse.