Killing God Became Lin Qiye's Favourite.

[Invincible + God + God-Slaying Derivative + +Double Male Protagonist] Gu An traveled to the God-Slaying World and became Lin Qiye's childhood friend, even one year younger than Lin Qiye. At the beginning of the plot, Gu An recovered all his memories and regained his full strength. Gu An's identity is not only a plane traveler, but also an immortal emperor. Emergency lightning protection! ! (I don't join the Night Watch because the author is a liberal and doesn't want to be bound by too many rules. In the article, Gu An will not have a good impression of the Night Watch at the beginning, and later he will become a temporary guest invited by the Night Watch. And I have not read the original work, only the fanfic series)