She was only sixteen years old when we met, and she was her senior sister. From meeting to acquaintance to getting to know each other, they separated after four years of love. Met five years later. What kind of story will happen to them... "I love you, but I hurt you." "No matter what happens, I only want to remember your kindness as long as I live." "I hope there will be no time to look back, and we will grow old together holding hands."