Teukjongeul Wonhae?!

Jeong Eui-Jun, an entertainment reporter for a gossip magazine, is commissioned to investigate Gu Hyun-Seong, a second-generation chaebol who started out as a child actor. During the sluggish investigation, Eui-Jun impulsively sleeps with Hyun-Seong. Worse, he's caught being a reporter! Eui-Jun imagines the worst possible outcome. But Hyun-Seong, with a sly smile, makes a new proposal...

(Source: Lezhin, translated)