Kang Daesung is happy with Big Bang. Lee Hana is an international model. Kim Hyunki has become a famous pianist.

Seventeen years ago, they were just three little kids who spent their days together in the same kindergarten. They made a promise to keep their friendship forever. They would always come back to each other.

Who could have thought that they still keep their promise even after seventeen years, even after they are happy with their own amazing lifes.

Yes, they love each other and they promise to stay with each other, no matter what. But, it was seventeen years ago, when they were still naive.