Mi romance secreto
애타는 로맨스 (original)
A nutritionist gets entangled in a series of misunderstandings with her new chaebol boss -- who turns out to be someone she slept with in the past.
Starring Sung Hoon, Song Ji-eun, Kim Jae-young, Jeong Da-Sol, Kim Si-young, Im Do-yoon, Lee Hae-in, Baek Seung-Heon, Nam Gi-ae
Watch "Mi romance secreto" on Rakuten Viki released in 2017. It's a comedy and romance show, and has a rating of 7.1 out of 10 from Imdb which is usually fine for this kind of show, and is currently available to watch for free.