Bully and Stalker

Jun-han Go has a rotten personality, but he's smart. He's good at pretending to be a good person without getting caught. Despite his disadvantaged family background, he found a way to make a life for himself and seemed destined for success as an influencer... until he escaped a hit-and-run accident and meets into an annoying ex-classmate, Habin Shin.

(Source: Lezhin Entertainment, translated)