Transmigrated To The Apocalypse As A Mob Character

Bai Yingxia, a university fresh graduate, found herself transmigrated into an apocalypse novel as a mob character after getting drunk during the graduation party. Unlike other fellow transmigrators, she doesn't have big ambitions, nor any intention to snatch the position as the Female Lead. All she wanted was to survive the incoming apocalypse and stay as far away as possible from the protagonist couple. But who could tell her why the man she picked up clings to her like a dog-skin plaster and demands an official title as her boyfriend?