MC Hates he was transmigrated and so won't speak. Father offered reward to the fist person to get him to speak. Guy takes him into a barn that not been cleaned for a while and his first words are "This place smells like shit"
So an MC was transported to another world and his dad was there too? Honestly sounds like a kid who moved to a new place sulking and dad paying someone to get him over it (or at least start).
Possible but unless they are very young they are unlikely to randomly adopt a mute boy. Could be a priest or someone named Father? In any case, I’m just assuming a more likely scenario but not dismissing other scenarios as the chances aren’t zero