Boangyeonggo!

As a skilled hacker, Gyeon Woo-Min is hired by a criminal organization to infiltrate Taeyoung Corporation and steal data. However, when the security system goes off, he's caught by no other than the CEO, Tae Beom-Hyun. Instead of calling the cops, Beom-Hyun offers him a deal that's little better than a slave contract. Left with no other choice, Woo-Min signs the contract and finds himself carrying out all sorts of risky and provocative errands ordered by Beom-Hyun.
(Source: Lezhin US)
Note: Includes seven extra chapters.