Jongin has an infamous reputation in terms of love. However Soojung knows better, after all she was his first.

        Kim Jongin, otherwise known as Kai is the new boy on the block just in time for summer vacation! Idol looks. Perfect body. Every female in the nieghborhood wants his phone number, apart from Jung Soojung who's already had her share of male fandom not too long ago. Will Kai endure this hot season with the help of an odd ice cream driver, the cold-yet dorky ullzang and his trusty skateboard?

Krystal is failing and stuck paired with the most obnoxious, conceited, know-it-all jerk - Kim Jongin as her math tutor! The antagonizing, difficult subject she fails to exeed, yet must comprehend otherwise it is hello summer school and bye-bye beaches and fun.