Old Zhang always kept the candies his grandson gave him in a tin box, saying he would 'save them for later'. Out of curiosity, the grandson peeked inside and found the box filled with melted candy pieces—turns out Grandpa had lost all his teeth and could only save them until he came, unwrapping them one by one to feed him. That day, Old Zhang trembled as he took out the last candy, and the grandson suddenly grabbed the candy wrapper, imitating Grandpa's way from back then, saying: 'Good boy, open your mouth.'