Is it The dangerous convenience store?
no it's not. actually i thought it was Saturday's Master bc of the cover, they share some similarities if i remember.
Maybe this?
Cherry Cake
https://www.mangago.me/read-manga/cherry_cake/
The dangerous convenience store?
YES THIS ONE!! I HAVE TO CHECK IT FIRST. THANK YOU SO MUCH.
any of you familiar or know this title. I don't remember the plot but just a certain panel. It's where the ML is a gangster and once barge in some rundown or small convinience store. I think the MC is somewhat related to that store and there is one time where the MC called out the ML for smoking in front of the store. I don't know if the ML and Mc are working together. I don't remember exactly. huhuhu
Ps: since i have foul memory, the ML's role could be somewhat different from what i remember. idk if he is gangster or detective.