The childhood sweethearts who grew up together, from getting to know each other to falling in love, everything was so logical. However, we always ignore the impermanence in life. When another relationship meets unexpectedly, is it destiny or an accidental mistake? When love comes, we long for and be moved. When love leaves, the person you loved exists in the best years. Whether it is sweetness or pain, it truly exists in life and becomes a part of life.