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.
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| Sound | Kim Dong-wook | Original Music Composer |
| Sound | Kim Jung-sook | Production Sound Mixer |
| Writing | Shin Joon | Writer |
| Directing | Shin Joon | Director |
| Camera | Kwon Young-il | Director of Photography |
| Editing | Park Min-sun | Editor |
| Production | Cha Won-chun | Executive Producer |
| Costume & Make-Up | Jang Joo-hee | Costume Design |
| Production | Kim Ji-hye | Producer |
| Sound | Kim Pil-soo | Sound Supervisor |
| Sound | Chung Min-joo | Sound Supervisor |
| Production | Je Jeong-ju | Producer |
