My Girlfriend Is the Man! S01E01 - The Change

Yoon Jae and Ji Eun, a couple from Yeonhee University, plan to go on a two-day trip together. However, just before the trip, Ji Eun turns into a good-looking man. Ji Eun and Ji Hye try desperately to hide this fact from Yoon Jae by pretending to be sick while Ji Eun contemplates whether to tell her boyfriend the truth or not.