Night Light
불야성 (original)
A coldhearted heiress, a man from her past and an ambitious new hire in her company all become entangled on a battleground for money and power.
Starring Jin Goo, Jeon Kuk-hwan, Lee Yo-won, Shim Yi-young, Jung Hae-in, Jung Dong-hwan, Song Young-gyu, Uee, Lee Jae-yong, Choi Il-hwa
Watch "Night Light" on Netflix released in 2016. It's a drama and romance show, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of show.