Office Girls (2011)

Qin Zi Qi is very similar to Gook Seung Hyeon, both are heirs that have to go incognito into their own firm and the main female teaches them how life should be lived at work.

It is a workplace setting with the FL working hard to save money. ML comes into the company and finds the FL interesting. A lot of supporting and side characters

The premise sounds pretty similar. The rich guy moving to a poor neighborhood to start from the bottom and the poor girl that helps him out.

Office girls had a similar feel. Some silliness, some cuteness and entertaining actors.

Both dramas has the same main male star.