Why did President Zhou lose his smile?

Because Xiaoxiao was born out of wedlock.

Xiaoxiao is the illegitimate daughter of President Zhou's daughter. She was a child with others before she married Tang Jia. At that time, unmarried children could not be alone if they were known.

President Zhou quietly threw the child away in order to keep his daughter's reputation. She lied to Zhou Lan that the child was saved because of premature birth.

Plot:

In the late 1970s, at the age of nearly 30, Du Juan, who has a child's height and appearance, adopted a girl named Xiaoxiao. In order to smile and dance, Du Fu started a business in the city and started a snack business.

After several years of struggle, Du Fu's business was on the right track, and she also sent Xiaoxiao to a professional dance school. However, the vain smile began to have a bad feeling for the cuckoo.

In order not to drag Xiaoxiao down, Du Fu embarked on the road to find Xiaoxiao's biological parents. A small dancing shoe left over many years ago made the mystery of Xiaoxiao's life experience surface.

For the future of Xiaoxiao, Du Fu chose to send Xiaoxiao back to his mother's dance teacher Zhou Lan, and still silently guarded Xiaoxiao. Xiaoxiao didn't get the life she wanted in her new home. She was ostracized by the Zhou family, injured her eyes in an accident and was in danger of blindness.

Xiaoxiao began to miss her adoptive mother Du Fu and wanted to go back to Du Fu. Du Fu also cured Xiaoxiao's eyes through hard work, and finally got back together with Xiaoxiao.