After losing her job and hitting rock bottom, Yeo-reum suddenly and without a plan sets off for Buyeo, where she's asked to travel in her place. In an unfamiliar place, among unfamiliar people, she encounters a warm hand for the first time, and the true meaning of "travel." And the clues that lead her on her journey: a prayer tree bracelet sent by her client and a 400-year-old sycamore tree she encountered in Buyeo. Why did she spend her summer here?