Okay, this one's a bit forced. He's a blacksmith, and a candidate for marrying into the family of the land's feudal lord. Him registering as an adventurer is a bit of a stretch, and it feels like it's a plot for two main reasons: Because it's what's done in stories with this type of fantasy setting, and because the author wanted to have one of those "girl gets hit on by rowdy adventurers" scenes.
If he ends up having to fight these idiots. I'm gonna be a bit peeved. This is supposed to be a story about blacksmithing and happy (not yet) married life, not one of the many fantasy action-adventure stories out there. This isn't a combat oriented MC with a cheat power, it's a craftsman MC with hard work and effort.