Sunjongjeogin Yusan

Inheriting a vast fortune overnight from a father he never knew, Nam Jaeho finds himself the unexpected master of a man completely devoted to him. Testing his loyalty becomes his latest hobby as he navigates this strange new reality, grappling with the complexities of power, submission, and the mysterious past that has brought them together.
(Source: Lezhin US)
Note: Includes seven extra chapters.