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

Sylvia felt better as a human baby because it helped her keep warm and hug her master...no, her Daddy now. Also, she enjoyed the envious looks from the three furballs!

Ren was also a lot more attentive to her human form since she looked like Fang... Sylvia was quite relieved that Ren finally had someone he loved with all his heart, and from what she'd seen so far, Fang was equally in love with Ren. Fang's magic was powerful, too - raw and untamed and needed a lot of work before he got close to Ren's level, but good potential, definitely.

What alarmed Sylvia was how much weaker Ren's magic had become in thia world. Ren quickly explained about his weak body and how the three furballs helped with his magic surges, and Sylvia's goodwill towards these newly acquired brothers and sister increased right away.

Fang was quite amused. "She really adores you, doesn't she?" he asked Ren.

Ren chuckled and rubbed Sylvia's head fondly. He didn't say anything.

79 - Steward Paul Gets a Shock