Transmigrated into a Book: I Bore the Male Side Character a Child and Drove the Male Lead Mad

[Transmigrate into a book + fast-paced + saving the devoted second male lead + satisfying revenge]

Ye Youyou was an experimental subject from Planet A. After accidentally traveling to different times and worlds, she was supposed to punish male leads whose "belated devotion is worth less than grass." Instead, she unexpectedly obtained a System. As long as she bore children for devoted second male leads, she could gain advanced technology and other powerful tools.

First story: A scumbag who hides his ideal woman in his heart while giving everything to the heroine × his neglected wife of three years

Second story: A tattooed street thug VS the beloved heiress Ye

The youngest daughter of the Ye family in Country B has gone mad. She rejects a wealthy young master and instead pursues a lowlife thug who fights and brawls for a living. Everyone says she must be bewitched. Just when they think he will abandon her, the man appears before them with a tattoo of the petite woman over his heart.

Third story: A useless beastman finds a mate in the most beautiful young female

Fourth story: A devoted older male supporting character never marries

[I tell everyone I don't want to get married, but really, I just can't marry her.]

Fifth story: The real and fake heiresses

[My dear little sister, don't you understand? All they want is a qualified heir, not a loving family.]