Oesarang

On the outside, Jeong Jaehan has it all. He’s a third-generation chaebol in charge of an incredibly successful film production company. Despite all the power and money, he’s been secretly suffering from a torturous ailment. After years of drugs and alcohol abuse, he’s lost the ability to orgasm- or so he thought. When someone from his past unexpectedly shows up, Jaehan experiences pleasure that he thought he’d lost forever...

(Source: Lezhin US)
Note: Includes 19 extra chapters.