Help can’t remember the name of the drama

Hi everyone!

I’ve googled every word I can think of, but can’t figured out the name of a drama I’ve watched a year ago. 

I think it was kind of a rich guy/ poor girl situation. I remember one scene. The girl is drunk in a bathroom hotel and tries to hide her money. So she puts it in the robe’s pocket and forget about it later. When she leaves the hotel, she bumps into an old classmate who treats her like she was some kind of a hooker. 

Does it ring a bell to anyone here?

Thanks a lot for your help!

I believe its a 2015 kdrama called Mask starting soo ae