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

Fang somehow ended up at a shady bar. He had already switched off his phone after seeing Pax's reminder to check his account statement in detail. Fang was a bit too irritated to do that at the moment.

"Young man, it is not good to drink so much at your age," the bartender said to Fang while pouring him the fifth glass of alcohol.

Fang smiled bitterly and drank some more, feeling painfully sober. Ren didn't let Fang drink more than an occasional glass of wine, saying that he was too young to drink, even though he was legally an adult now.

And Fang often heard his classmates in medical school talk about how getting drunk was one of the best ways to drown one's sorrows in a glass of alcohol. So, Fang had decided that he would get drunk today to forget about his current problems.

115 – Fang Makes a Mistake