Happiness has a formula.

Happiness has Formula is an urban emotional drama directed by Li Dong and Shen Lei, starring Gui Yalei, Dong Yong, Huang Jue, Liu Yihan, Yan Shu and Zhao Ziqi.

With the theme of "happiness", the play tells the tearful story of Song Yuhua and his three children who were widowed in his later years. The play premiered on Shanghai TV drama channel on 20 17125 October.

Since the death of his wife, Song Yuhua has been unable to adapt to the lonely and depressed life of "leaving a lock and entering a lamp". Her son Shen Yue felt guilty because his father went abroad to study and could not attend his father's funeral, and forced her to take her daughter back to her hometown in Hangzhou to show filial piety. However, her daughter-in-law Xu Li always has conflicts with her mother-in-law.

Shanghai's eldest daughter, Shen Mei, divorced and remarried without telling her mother, losing the custody of her children, while her youngest daughter, Shen Xiang, dared to love and hate her former brother-in-law, Chai Haiqing, boldly pursued her, which caused a huge contradiction between mother and daughter.

At the birthday party, children were absent for some reason. Mother lost face in front of relatives and friends and became a nanny in a rage. A report about "empty nesters leaving home as nannies" triggered public opinion and made children crazy.

When Shen Yue saw that his father-in-law was angry with his son, he felt guilty that "the son wanted to raise but didn't want to be close" and decided to give up overseas promotion and stay with his mother. Shen Mei divorced again because of domestic violence, and she was physically and mentally haggard and found uremia. Chai's ex-husband donated his kidney to save her, and they got a second chance. Shen Xiang finally found his love and made TV programs for the elderly. In the filial piety of children, mothers actively face life and enjoy every day of life.