Leader of the Snakeheads gang. Gay boyfriend. Doctor. Lab technician. Another gangster. Chinese consulate guy. Another gangster. Such were the types of roles actor Jack Yang has assumed over his 15-year acting career in Hollywood. Then, Steven J. Kung, a young, up-and-coming director, finally saw what was there all along in the handsome, 6-foot-tall Yang: a leading man. And both Kung and Yang got to play around with this idea of the coveted role that has long evaded Asian American actors in a new indie film, appropriately titled A Leading Man.