Yong-soon is an 18-year-old high school student. She falls in love with her gym teacher, but she thinks her teacher might have a girlfriend. Yong-Soon and her friends try to find out whether he does have a girlfriend, but they can't find any clues. Making things worse, her father brings a new stepmother from Mongolia.

• ATO
• Lotte Entertainment
• Lee Soo-kyung
• Choi Deok-moon
• Park Keun-rok
• Kim Dong-young
• Jang Haet-sal
• Choi Chan-sook
• Kim Ja-young
• Park Chul-min