Lee Donghae is an amnesiac. Following an accident that kills his parents, he trudges through the next few years trying to piece his past together. On an afternoon by the waterfall, a redheaded man approaches him, presenting a key that unlocks the Pandora's box to his lost memories. Does he take it?

Yesung and Kyuhyun have spent the last decade of their lives celebrating their anniversary in the exact same manner; they'd settle in the same restaurant several blocks down from where they lived and reminisce. Would this year be any different?