1. The score is not high, investors value the Douban score, and the score of the first part is not ideal, which hinders the shooting plan of the second part.
2. The hero Choo Ja Hyun is Korean. Due to the ban on Korea issued by radio and television, Choo Ja Hyun could not participate in the filming of the second film.
The above reasons are just speculation, and there is no official clear explanation at present.