When you two were little, you two accidentally met and you played. then you told Levi and asked him to promise that you and him would get married when you were older and Levi agreed and promised, then Yura gave Levi a ring to remember their agreement, then Yura went somewhere, when they grew up. One day, Levi accidentally collided with a girl "Hey, watch your way" Levi said in a cold tone. suddenly Levi's gaze fell on the girl's ring and remembered his promise