@Gorilla
I don't remember but it was another Korean manhwa. The story isn't exact but all of the major points are essentially the same.
1) Assassin class hits a wall.
2) Thrown out of the party/abandoned.
3) 40ish years old.
4) Faced impossible boss battle and "won".
5) Regressed into the past to start over.
There was even a scene where there was another assassin and the MC was teaching him how to operate his class which pis*** the assassin off. I wish I remembered the title now. It must have had at least 30 or more chapters.
