Rich Female Students - Korean Drama

I'm looking for new k-dramas to watch generally,
but I'm also looking for one specific korean drama that I watched but ddon't remember the name from.

In the drama, I'm searching for there were some scenes, where another student went into her house regurlarly to help her study. But she eventually started taking pictures in her room and with her clothing. And she was caught after a while, thank you in advance!