Run Papa Run (2008)

Run Papa Run 2008 / 一个好爸爸 2008 / Yat kor ho ba ba , Hei Ba Ba , A Good Father

A lawyer falls in love with a gang boss, gets knocked up and drags him to the altar. One evening, cradling the crying infant, he metamorphoses into a doting daddy, and henceforth devotes his life to keeping her from finding out his true identity. His light and joy grows into a teenager, and alas, falls for the son of a cop, while rival gangs move in on his turf.