I'm kind of sure it was a webtoon as it was based in Korea.
The protagonist was a demon and so were his friends. These demons did drink blood, but they mainly fed on emotions. One of them fed on jealousy, the protagonist fed on pride. When he saw or felt jealousy within someone around him, his hunger shrank. So if there was no one jealous, he'd die of hunger.
The story started out with the protagonist having a car accident. Since he's a demon, the scars didn't last long.
The demons had attraction abilities via different body parts too! One of them could attract someone by using hands; if he touched them then they'd fall for him (no matter age or gender). The protagonist's attraction was via his eyes; anyone who made eye contact with him would fall for him.
Since the protagonist had that accident, he had to take the subway to his work. He didn't like taking the subway, he hated it. He met a girl and they made eye contact but that girl didn't fall for him, which made him really suspicious. He went to his work, he was a plastic surgeon, and coincidentally the appointment he had was with the girl he met on subway. She wanted a breast implant.