Practice is the only way! A youthful comedy about teenagers whose physical growth came first!

In a cutthroat world where the life you’re born into decides your success, three aspiring youths are determined to change that perception as they fight for their dreams.

Hong Yi Young witnessed a murder but she cannot remember anything about what happened. With the help of Jang Yoon, she tries to recover her memories from that day.

Gong Woo-Jin is a 30-year-old single man and he works as a set designer. Due to a trauma he experienced 13 years ago, he does not want to have a relationship with others. When Woo Seo-Ri was 17, she fell into a coma. 13 years later, she wakes up from her coma. Her mental age is still that of a 17-year-old, but she is now 30-years-old. Gong Woo-Jin and Woo Seo-Ri get involved with each other and fall in love.