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

"Big Brother's son is finally home," the Dragon Queen said in a soft voice full of emotion. "It is good to have you home, child."

Fang nodded, his purple eyes full of emotion as well. He gripped Ren's hand tightly.

"Are you two feeling well enough to travel to our ancestral caves in the afternoon?" the Dragon Queen asked. "I was thinking that we could go after lunch – but I wouldn't want to tax the two of you too much, either. We could go tomorrow morning as well."

"We can go today," Ren said, before Fang could object.

Fang frowned at Ren. "Won't you be too tired?" he asked. "Don't force yourself."

Ren shook his head. "I'm perfectly fine, my big darling. There is no need to fuss," he said in a comforting voice. Then he turned to the Dragon Queen. "I am very curious about the ancestral caves and what you guys had mentioned back in Cosmopolis about Fang's father's familiar."

184 – Going to the Ancient Caves