When Jo Gang-Ja attended high school, she was notorious for fighting. She gave birth to her daughter A-Ran in her late teens and became more responsible. Her daughter A-Ran is now a high school student, but A-Ran is bullied at school. Jo Gang-Ja decides to go back to high school to protect her daughter. Jo Gang-Ja becomes a high school student again.

Hong Ra On, disguises herself as a man and counsels men on dating. Due to a love letter she wrote for a client, she meets Lee Young – future Crown Prince Hyomyeong. Hong Ra On is unaware that he is the Crown Prince and Lee Young is unaware that Hong Ra On is a woman. The Crown Prince becomes interested in Hong Ra On. His eunuchs become aware of this and attempt to get Hong Ra On to become one of them.

Dong Yi is a 2010 South Korean historical television drama series, starring Han Hyo-joo, Ji Jin-hee, Lee So-yeon and Bae Soo-bin. About the love story between King Sukjong and Choi Suk-bin, it aired on MBC from March 22 to October 12, 2010 on Mondays and Tuesdays at 21:55 for 60 episodes.

Dong Yi recorded solid viewership ratings in the mid-20% to 30% range, and Han won acting awards for her performance.