Lee Eunmi was a typical girl. Her class consisted of 29 pupils. The thing is, they're lacking guys. A new kid shows up and sure enough it was a guy making it an even 30. And she may have realized she had a crush on him. Namee, her best friend tells her that it is a crush but only till the 4th month mark, then it's love. Eunmi doesn't feel like giving in, so she wants to prove it to her friend that it's just a 'crush'.