Transferring back to Korea in his 2nd year of Highschool Cha Hakyeon were able to be reunited with his old friends. Life seems to be going back how it was before. But one person caught his attention the mysterious Mr. Jung who was seating next to him in the class.

"Why is this person always sleeping? why didnt the teacher scold him? and why is he nice to me?..."

Cha Hakyeon became curious...and began trying to find out a little something about Jung Taekwoon. But little did he know that in the process of trying to figure out his seatmate, Cha Hakyeon forgot of a promise made 4 years ago....