In 1966, Zahir Raihan was looking for someone to play the lead role of his new film "Behula". He chose Razzak who was then serving as one of his assistants. Razzak went on to act in films including "Abirbhab", "Moynamoti", "Taka Ana Pai", "Dorpochurno" and "Jibon Theke Neya" (1970). After the 1971 Liberation War he continued working on the films "Manusher Mon", "Ora Egaro Jon" and "Osru Diye Lekha".