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 the heads of all departments of SIMS converged on Ren's room in a panic, they found the "flatlined" Chairman Ren sitting casually on the bed with Prince Fang's head in his lap.

Pax and Wolf stood on the side with impassive faces.

"What happened?" one of the senior doctors finally had the courage to ask.

"Fang fainted," Ren replied with a sigh. "I think he's been stretched a little too thin. "If you all have no more tests to run on me, can I take him home?"

No one had any objections to that. Chairman Ren could stay at home while they waited for some of the test results – and none of them had been able to find anything wrong with Ren anyway. Besides, Ren's vitals had been stable. He was weak, but his situation had not deteriorated since the day he had his heart attack all of a sudden. If anything, he was slightly better now.

204 - The Rumours of My Death are Greatly Exaggerated