The Big Shot Has My First Love's Face

Gu Qing inexplicably transmigrated into a book, and not just any book, but one set in an apocalypse full of danger. He thought dealing with zombies would be trouble enough, then he suddenly realized that the book's protagonist not only shared his first love's name, but also had his first love's face. What was he supposed to do? Asking online, pretty urgent. (つд?)

Theme: Every cause must have its effect.