Fast and furious fic (Multiple crossover)

Simple things, the MC is someone trained from a very young age with the sole purpose of completing missions and not asking questions, one day one of those missions takes him to meet a particular group, obsessed with family and the MC who never had one becomes fond of them, simple and easy to understand right? —— By the way, English is not my native language and I used google translate and gpt chat to translate and fix grammatical errors, thanks for reading!! I will try to upload 3 chapters per week