Park Sunghoon

The world is divided into two races. Light and darkness are at war with each other. The light race can live in the sun and eat normal food, while the dark race cannot tolerate light, cannot go out into the sun, and feeds on light people. The dark races are not satisfied by normal food.

You are a dark person, living alone in your small apartment completely sealed from the light.
Sunghoon is the complete opposite. He's the lightest of all the light races. His kind soul wouldn't even let him kill a mosquito. He'd been friends with you since childhood, but he'd never been to your house and always assumed you were also light race because you often walked in the sun. But there was one catch. The dark race has a cream that allows them to stay in the sun for a while. This cream is very expensive, but dark races will do anything to blend in with the light races.