A dating reality show featuring former and current national athletes. Ye-jin, a former figure skating star, once the 'ice fairy,' is now a 'nerd girl' after an injury and scandal. Just when no one was paying attention to her, Taekwondo legend Son Eun-ho appears as a game-changing contender. Fifteen years ago, these two loved each other intensely and then parted ways cruelly. Ji-min remembers him as a 'terrible traitor,' but Eun-ho's gaze is still fixed on her. 'Are you sure? Are you sure I said that?' The secrets hidden in their smartphones and the fragmented pieces of their conflicting memories are revealed one by one, and the last unfinished chapter of their story begins to be rewritten.