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

"It is good if Ren didn't activate it on purpose," Pax muttered. "But if he didn't do it himself, how did it become like this? What could have triggered the reactivation of this reflection magic?"

"Could it have something to do with dark magic?" Rudy asked Fang. "Papa, was there anything in the books you have been reading?"

Fang shook his head. "I don't remember seeing anything about reflection magic," he said. Then something struck him. "But there was a mention of deflection magic – maybe there's something!" He rushed out of the room before anyone could stop him.

Wolf and Pax looked at each other and sighed.

"Let him research," Uno said softly. "Little Brother Fang is very distressed – if he is able to find something in his dark magic books that may be of help to Ren, it will be a good thing. Even if he can't find anything, at least he will be productively occupied until Ren regains consciousness."

243 – Bloodline Magic