Uri Sangnyuyeonae Halkkayo?

Handsome, stylish, and capable, Jinah is often mistaken as the heir of the company he works in. In reality, his polished look is just that--a facade he maintains in hopes of entering elite society. It’s not easy to keep up appearances, but Jinah is surely inching up the social ladder. Until, that is, a bungling subordinate nicknamed the “ticking bomb” is assigned to his team. Like Jinah, though, new team member Do-hyeon is not who he appears to be.
(From Lezhin)