Note: This isn't a Hong Kong crossover in the traditional sense. The author wants to try writing something more expansive.
The transmigrator Xu Shenzhi is reborn and heads south to Hong Kong Island with a group of fellow veterans to start a business, build it into something big, and make a glorious comeback.
There are cheats, but a little cheat doesn't count as cheating.
No harem, though the possibility of flirting around isn't ruled out.
There are guns, but everyone obeys the law.
I hope you enjoy the Hong Kong crossover world I've created.