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

Ren tapped his chin thoughtfully. "The first time Fang and I met the Dragon Queen – she made a pass at me," he said. "Now, anyone with eyes can see that Fang is far more attractive than I am. He is so beautiful. For ordinary people, I can still understand that they would find me more profitable back then, because Fang was still a high school student at the time, after all – but for someone powerful like the Dragon Queen, it didn't make sense at all that she would take to me and not to Fang."

Wolf rolled his eyes. "So someone's behaviour is strange because they made a pass at you and not at Fang?" he asked. "What kind of logic is that?"

Ren shook his head. "It's not just that, of course. It's the fact that she seemed actually quite delighted when I turned her down point blank and not only did she not take offence, but she has also become one of our biggest supporters since then. Don't you find it a bit odd?" he asked.

151 – Ren Travels