Transmigrated into a Book as the Second Male Lead, and the Heroine's Character Went Off the Rails

Gu Xi, once a super-rich second-generation heir, transmigrates into a romance novel as the second male lead because of the System. Originally, all he has to do is follow the plot to the end and he'll be able to return to his original world. He's supposed to be tormented by the heroine and act like a lovesick simp, but Gu Xi discovers that things aren't following the plot at all.

"The heroine actually confessed to me directly?"

"The male lead has become a lovesick simp instead?"

"System, are you malfunctioning?"

This novel and its characters are entirely fictional. Any resemblance to actual persons or events is purely coincidental. Do not imitate.