A mother left her children a long time ago and remarried. The remaining three children have lived together without their mother. One day they suddenly receive their mother's letter. With the letter, the three take an unexpected trip together to meet their mother. They said, "Three siblings," but in fact, they are four siblings. The youngest one had already died years ago in a heartbreaking accident and is only alive in the hearts of the remaining family members.
—AnonymusB