Happy Din Don (1986)

A wannabe musician named Fat (Michael Hui) witnesses a drug deal gone wrong. He flees to mobsters lead by Ironhand (Cheung-Yan Yuen ) and hops on a cruise ship with his partner-in-crime Tat (Siu-Tin Lai) to hide from the pursuing hit-men. On the ship, Fat takes to the liking of a beautiful singer named Din-Din (Cherie Chung).