Kim Ahyoung or better known as Yura is the purest and most innocent girl at school. Never in her life did she have any problems or did something bad or nasty. That's until a famous group named Infinite starts attending the same school. They become to know about the purify princess' personality and immediately make a bet.

Whoever gets her first kiss first, will be given a special gift which will be only given to the one, who plays fair.