Development Director Sun Haipeng had not initially planned on creating a sequel to
I Am What I Am, but following positive reception after its release, he began development on the second film in March 2022. Although Shanghai was initially chosen merely to take Gyun out of familiar territory, Sun later realized that it had a "strong martial tradition, despite its modern veneer [...] demonstrated by its association with figures like kung fu master
Huo Yuanjia". Places the characters live in were based on traditional Shanghainese
shikumen architecture from the late 1800s and early 1900s, and "Workers' New Villages" (),
public housing built by the Shanghai municipal government from the 1950s onwards. Sun's visit to a soon-to-be-demolished building inspired the cramped apartment shared by Gyun and his friends. Screenwriter Shen Cheng provided advice on the film's portrayal of
wushu, having been a practitioner for twenty years, competed in tournaments, and written several
wuxia novels. ==Music==