There is a TV play about cheongsam. I don't know the name.

It's the TV series Gone with the Wind.

Starring:

Zhang ()? Sammul He (Sammul Chan)? Chongyang (Luo Jin)? Ma Kun/Xiao Jian (Tan Kai)? Zhang ()? Xu Na (Xu Qiwen)

The story you told is roughly in these episodes:

Sixth set

Lotus nut returned to the dress, and Mo Jun mistakenly thought that Chongyang was the man who made Lotus nut pregnant, and rebuked Chongyang for being selfish and not knowing how to love Lotus nut. Chongyang was kicked out of the dress and sent a bowl of sugar porridge to Lianxin every day.

Seventh set

Three years later, Lian Xin began her career. Chongyang rented a decent little house in Yaoshui and invited Lian Xin to live together. The two lived a cohabitation life of sleeping during the day and sleeping at night, arguing with each other.

In order to save enough money to go to Nanyang, Lian Xin and Chongyang held a piggy bank competition to see who earned more money.

Mo Jun and other workers are all sick, and Lotus plumule provides a good treatment for everyone. Lianxin went to see Xu, the president of the pharmaceutical company, and sent clothes to the young lady. Xu Na asked Lotus to put on new clothes, and had a whim to ask Lotus to play tricks on her long-lost fiance Sammul He, and promised to order ten sets of cheongsam in her dress afterwards, but Lotus had to agree.

Sammul He University classmate Kang Yuan's mother asked him for help. Through clever reasoning, Sammul He revenges Kang Yuan. Lotus plumule in cheongsam has a unique style. Xu Na took Lotus Nut to the royal family, and Sammul He saw Xu Na and Lotus Nut's makeup tricks.