Old Master Q 2001

Master Q and his 2 friends Mr. Chung and Potato are out looking for jobs but accidentally cause an traffic accident for Mandy (Cecilia Cheung) and Fred (Nicholas Tse). As a result, both have lost their memories and due to circumstances, they have become enemies... but then, true love will eventually reunite (with a lot of help from Master Q and Potato).
(source: themovieb.org)