Are they going to send him after his old master, or have they already died?
Not quite.It would be funny if someone sent his master a request to assassinate the MC, and it was the idiot guild staff member.
I doubt the letter itself is ten years old, it's maybe a few months old.Following up on a 10ish year old request for an assassination sounds like a bit of a lark. Might be a bit of fun tracking both sides down and figuring out if one or both sides would better society if they were to fade into history.