Overview
Kang Hyun-Ho has never had a boyfriend in her life. She begins swimming lessons at a sports center. There, she develops a crush on Jo Woo-Jin . Meanwhile, Han Yoo-Ra is Kang Hyun-Ho's swimming instructor. He develops feelings for her.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 24 | 31 | |
 | 30 | 37 | |
 | 23 | 30 | |
 | 43 | 50 | |
 | 38 | 45 | |
 | 33 | 40 | |
 | - | - |