Deal of Reincarnation (S01E02)

The world's greatest Assassin takes on a mission from the Goddess to eliminate the Hero. After defeating the Demon Lord and rescuing the realm, the Hero plans to use his newfound power to bring about its destruction. To prevent this catastrophe, the Goddess offers the Assassin a chance at reincarnation in a different world to carry out the assassination. Having been betrayed and killed by a client in his past life, the Assassin agrees to her proposal, eager for a fresh start. However, the challenges ahead may be more than he bargained for.