Buseojin Sonyeon

Choi Ho-Yun, the second son of a prominent government official, resorts to selling himself to a stranger to undermine his abusive father's reputation. By chance, his first client happens to be Se-Hwan, a former close friend of Ho-Yun's older brother. Se-Hwan's dark desires ignite fury and stir up the scars and trauma within Ho-Yun, leading to a secret deal aimed at tearing down the Choi family.
(Source: Lezhin US, edited)