I Transmigrated Into a Book as the Villain’s White Moonlight

Two Male Leads + Transmigrate into a Book, Ancient Setting, Villain, Yandere and Unhinged

Gu Chengsu was born into the world of a book he had read in his previous life, as a minor character who was also the unattainable dream of many. He barely appeared in the story! Because the frail dreamboat rarely left home, he never appeared at all in the later part of the plot, and no one knew whether he was alive or dead.

The dreamboat was speechless. '...'

After transmigrating into the book, Gu Chengsu escaped the troubles of his original world and had plenty of money and free time, enjoying a carefree life. The only downside was being bound to a System that forced him to work: lowering the villain's corruption level so he wouldn't destroy the world, and, while he was at it, turning him into a well-rounded young man.

But later, it seemed Gu Chengsu had taken the training a little too far. The way the villain looked at someone seemed a bit off.