Mystery Freshman (2016)

Ah Young fails to enter Myungsung University for the second time, so she lies to her family and tells them that she got in. Her cousin Jung Eun is a freshman at the university and becomes aware of Ah Young's lie. Jung Eun asks Ah Young to attend her classes and pretend to be her. And so Ah Young meets Min Sung, a freshman who has a secret. He used a fake name to enrol in a university.