Between The Twins (1978)

Original title: 孖生姊妹

This lighthearted sitcom follows the life of twin sisters with contrasting personalities. Zhou Xinggui is a wedding dress designer with an open mind and a trendy appearance. Due to her work, she gets to know a married dentist and gets involved with him, leading to many funny incidents and misunderstandings. Meanwhile, her sister, Zhou Xingzhi, works as a nurse in the dentist's clinic and is conservative in her thinking, stern, and opposes her sister's relationship with the dentist. To make things more complicated, Xingzhi and the dentist's wife are good friends, leaving Xingzhi in a dilemma.