once upon a time, 5 young boys meets love for the very first time: jihoon fell for his teacher... woojin fell for a university student... jinyoung fell for his brother's girlfriend... daehwi fell for his bestfriend's sister... guanlin fell for his school senior... what do they have in common? they all fell for a noona. dear noona is a story about how these boys attempt to show the world that in love, age is just a number.