Jaywalker_Holmes

Ren, a modern doctor and a secret master magician, suddenly finds himself inside a random book he picked up at the airport...as the villainous older brother of the protagonist. As the bad guy, he's supposed to make life difficult for the Male Lead until the latter grows up and kills him in revenge. However, looking at the broken teenager in front of him, Ren can't help but feel his heart soften. 
Fang was an orphan who had never known what a family is. Abandoned at birth, all he knew was pain and fear. He loved nothing, and wanted nothing...until he saw the angelic Wade. To save Wade, Fang didn't hesitate to sacrifice himself. ..after all, there was no one to cry over him.
But then, Ren appeared and turned his world upside down.

The Villain Saves the Male Lead

"When do you plan to tell Fang about all this?" the Dragon Queen asked Ren.

Ren frowned. "I'm not sure," he murmured. "Should we wait until we know more…? I would like to know how he ended up in the Orchid Orphanage, and how the seventh prince of the Valley Kingdom and the current empress of the Valley Kingdom found him. And, if they had always known that Fang was in the Orchid Orphanage – then why did they leave him alive? And when they found him a few years ago – why did they still leave him alive?"

The Dragon Queen sighed. "You have no idea how vicious that woman is, Chairman Ren," she said quietly. "And if her son takes after her, then he should be same. And if he takes after his father, then he is a spineless creature that simply listens to his mother. It is, however, possible, that this time, the seventh prince actually did turn up to pursue Fang. He may not be aware of the true identity of Fang."

153 – Ren Feels Like A Proper Villain