Quick Transmigration: Saving the Lovable Underdog

The author's writing style is average, maybe because the chapters are compact, so many places are a bit simple and crude. The male protagonist traveled through time and space and successfully counterattacked for the original owner and gained points. However, in the end, because he fell in love with someone in the mission world, he was forced to separate from the system, delete his memory, and return to his original world. What kind of tragic ending is this?

Just average...