Undying Heart (2006)

Jiahua, Jiang Nan, Ah Wen, and Ai Lun were college classmates many years ago and were close couples. Nan suffered from a speech impediment, and Jiahua, far from minding her limitations, was drawn to her innocence and affability. However, years later, Jiahua's relationship with Nan has long since fizzled out, primarily due to Nan's sudden dropout from school and subsequent lack of contact. In contrast, Ah Wen and Ai Lun remain together and even run a bar together.
One day, Ka-wah runs into Nam again at Man's bar. Ka-wah has been obsessed with Nam for years, but unfortunately, Ka-wah already has a girlfriend, Karen, who's planning to get married. Nam's return is part of a plan with his friend Ken and his uncle, Fatty. Nam arranges for Ken to work at Karen's design firm and has Fatty spy on Ka-wah and Karen, all to help Nam obtain the information he needs...