Quick Transmigration: After I Became a Stand-In, the Trashy Ex Begged Me to Come Back

In her previous life, An Sheng was a substitute, but she had a strong sense of right and wrong and refused to be with a scumbag. In the end, he got her killed.

To get revenge, she bound herself to a Substitute Comeback System.

After arriving in other worlds, An Sheng realizes that nothing beats studying.

The male lead is dating, while An Sheng studies. The male and female leads argue, and An Sheng keeps studying. When they come to her door, An Sheng is ready. She shows off the results of her studies and crushes them.

Faced with an outstanding An Sheng, the scumbags want her back, only to discover that she has long since become unattainable.

An Sheng: I'll work hard in secret and study the male and female leads into the ground.