A Fist Within Four Walls is a Hong Kong television drama created by Jazz Boon for TVB. It is a martial arts action serial drama, and revolves around kung fu masters living in the triad-ridden Kowloon Walled City during the early 1960s. The drama stars Ruco Chan as the series' protagonist, a gifted martial arts novice who, along with a group of young kung fu masters, take down the walled city's largest criminal organisation, the Fellow Association. The drama also stars Nancy Wu, Benjamin Yuen, Philip Ng, Yuen Qiu, Grace Wong, and Moon Lau in lead roles.