The critical reception for "A Fist Within Four Walls" has been generally positive. On Douban, a Chinese media database, the drama received a rating of 8.1 out of 10 based on 5,000 votes. Most of the critical praises were directed towards the drama's writing, cast, and fight choreography. Hong Kong filmmaker Patrick Kong gave the first five episodes a positive review, calling it one of TVB's "most chase-worthy drama in recent years." He applauded the drama's compelling story-telling and its well-directed fight choreography. Online critics praised the drama's humor, action-packed story and well-written characters but criticised the predictable plot and the overuse of slow motion shots during the fight scenes. Several critics noted the cultural elements of the drama, and interpreted them to be a social commentary on Hong Kong's current political situation. The last episode received mixed reviews. Lam Tung-yin of "HK01" said the last episode was ridden with clichés, corny twists, and that the final villain was given an anticlimactic and lazy ending. The following is a table that includes a list of the total TVRs (rating points) based on television viewership. "Viewers in millions" refers to the number of people, derived from TVB Jade ratings, in Hong Kong who watched the episode live. The cast has expressed interest in returning for a film sequel, should there be one. Boon said doing a sequel "is possible", but it would happen only after he completes his priority projects.