If you liked The Devil's Plan you will definitely love to watch this series of 4 seasons The Genius, produced and directed by the same people.
What a treat to watch a bunch of clever and humurous people together. I loved all the seasons.
Every person is unique in their own way.
Though the gap between these series is of 10 years, I was utterly impressed by the choice of games and the casting.
You must watch all the seasons, I bet you'll enjoy every bit of it.

If you have liked Business Proposal then You will definitely LOVE What's wrong with Secretary Kim. It's my all time Favourite (can never get bored of it).
Similar office romcom vibes.
Rich Male CEO and not so rich Female Employee.

And since you have watched the kids, then you should meet their parents as well ;)
So go for it. I can bet that you'll love it!!