Zhou Zheng is a thief in the apocalypse, struggling to survive in the ruins. He encountered a giant mutated monster, defeated it after a fierce battle, obtained a strange crystal, and continued on. In an abandoned factory, he encountered unfriendly people and ran away after negotiating to no avail and hid in the basement. In the basement, he first stepped on the shriveled corpse of a rat, and then encountered a python, which he killed after a desperate struggle. Exhausted, he still didn't rest and continued to search for a safe exit deep into the basement.
Very good science fiction film