The story of Happy Birthday, Mom is poetic and heartwarming. Mothers never forgot the birthdays of her daughter and husband, but she always forgot her own birthday. The little girl and father decided to surprise the mother. They quietly prepared a birthday cake and hid it in the little girl's room. This was a secret of the father and daughter. Mom came back. It seemed that she had completely forgotten her birthday. The little girl was a little sad and a little nervous. She went to her room to smell the cake from time to time, imagining what it would look like when her mother saw the birthday cake. As a result, the mother inadvertently discovered the secret of the little girl and father...