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 Ren regained consciousness, he was back at home and in his own bed. It hurt all over.

Daddy? A soft voice called and Shadow nudged Ren's face with his little wet nose.

"Hello, my little Shadow," Ren whispered. "What's happening?"

Shadow's big golden eyes were misty. Daddy hurt?

Ren couldn't deny it, but he raised his bandaged hand and rubbed the little pup's grey fur gently. "What have you been up to while I was gone? Did Papa and Uncle Pax give you nice treats?" he asked softly.

At the mention of treats, the puppy's attention was successfully diverted.

Ren sat up gingerly and smiled wryly. This situation was getting a little too repetitive for his comfort, he thought to himself. The original Ren-the-villain had not been in the habit of fainting or getting injured this often, for sure!

64 - Back Home Again