Fantasy: the Gunsmith's Self-Cultivation

After his death, Zefan traveled through time as a gang boss. In another world, he still wanted to be the boss and become bigger and stronger. "Is this product pure?" "I'm an alchemist and I can still sell you inferior elixirs." "I asked you if you want to be pure?" "Did you do it on purpose? Do you want it or not?" P. S. This is my first time writing a novel. If there are any deficiencies, please give me some suggestions. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.