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

After showing everyone around the house, Fang informed the guests that Ren had no idea about his upcoming birthday party and requested them to keep it a secret.

The Dragon Queen already knew about this, and the other three were really amused by Fang's innocent thoughts.

"Are you sure that Chairman Ren doesn't already know about it?" Prince Uno asked with a frown. "He is a smart fellow, isn't he?"

"He is smart, but he doesn't know," Fang said.

"What Fang means to say is that Ren is utterly oblivious," Wolf said. "If it hadn't been for Fang taking action, the two of them would still have been pining after each other."

All the four new guests were stunned to hear that, even the Dragon Queen.

"Seriously?!" Princess Una asked, her purple eyes, the same as Fang's, widened in shock. "Our little brother Fang was the one who took the first step?"

165 – Nocturnal Discussions