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

The captured leader was still not awake when Wolf brought Ren to the place where all of criminals were being held.

The lackeys, with the help of the 'special treatment' from the Blue Wolves, had already confessed to everything they knew – which was not a lot. They were indeed from the Valley Kingdom, and most of them were just random goons rounded up and brought to Cosmopolis with the lure of robbing the wealthiest people in Cosmopolis and taking all their wealth for themselves.

The deputy leader of this ragtag group was a tougher nut to crack, and clearly a person with a fair amount of training.

"You do know that we have caught your leader, don't you?" Wolf said to the deputy leader with a wolfish grin.

The deputy leader paled but remained silent.

Ren simply ignored the deputy leader and headed to the cell where the leader was being held. The member of the Blue Wolves guarding the door opened it and led Ren and Wolf inside.

228 – The Identity of the Leader