[1] The series follows the story of three vastly different urban women who have reached their thirties while facing challenges at a crucial stage in their lives, as they leave behind their youthful, carefree 20s to embrace the "adult" life of a 30-year-old, and ultimately decide to take matters into their own hands.

She helped her husband become the CEO of a fireworks company, and fought rich housewives who bullied her son.

Zhong Xiaoqin is content with her average life, with a normal job and a husband who likes fish.

Gu Jia begins to suspect her husband Xu Huanshan of having a young mistress, Wang Manni faces difficulties with sales and relationships, and Zhong Xiaoqin's idea of a perfect marriage is destroyed.

The name "Sān Shí Ér Yǐ" (三十而已) based on a sentence "As thirty, I stood firm" (三十而立) comes from Analects.