The Sickly, Obsessive Male Lead's Beloved in the Apocalypse

[Apocalypse + stockpiling supplies + space + transmigrate into a book + yandere + unhinged + invasion by alien species + global System panels + instances + territory System]

College student Yu Mianmian is kidnapped by a criminal and stabbed to death before anyone can rescue her. When she opens her eyes again, she's lying in bed, aching all over. There's also a man sleeping beside her. Memories from this body reveal that she's transmigrated into a book. The man next to her is the male lead, Song Wuyuan, and she is his evil girlfriend after the apocalypse, a tool meant to help him grow.

Yu Mianmian silently encourages herself to treat the male lead well.

Later on, Yu Mianmian rubs her sore back and says she regrets it.

After Song Wuyuan finds out, he pulls her back under the covers.

What a devil.