Need help finding this BL manga

It was set in Kowloon city, and one of the boy is a pharmacist inside the city living in a really tiny unit, and there was some gangsters involved I think. The seme got injured and needed to stay in his house for treatment, and that's all I can remember.

I read this years ago but can't find it anywhere, still hasn't finished it.

Pls help, I want stories set in Kowloon
╥﹏╥