Red candy
https://www.mangago.zone/read-manga/big_apple/ (idk why it's called big apple XD )
https://www.mangago.zone/read-manga/red_candy/ (don't evn ask my why it's red candy i don't know lol XD)
its called big apple cuz big apple is a nickname for new york, where the story takes place. and its called red candy because thats the mc's codename as a spy. idk why he chose red candy of all things tho lmao
Not sure if these are quite what you’re looking for, but here goes:
https://www.mangago.zone/read-manga/omerta_1/
https://www.mangago.zone/read-manga/momento_scarlet/
passion is kinda agent like but u probably already read it
Yall just finished re reading codename anastasia and i need some agent bl rn ヽ(`Д´)ﾉ