"29 1" is adapted from the popular Hong Kong stage play of the same name directed by Pang Xiuhui. It mainly tells the story of two women who are about to turn 30. When faced with the troubles that most women of the same age will face, they choose completely different attitudes towards life. One is Lin Ruojun, who is about to turn 30. She faces the challenges of escalating pressure at work, her parents are seriously ill, and her love relationship is like a chicken rib... These sudden insecurities make her feel unprecedented fear. The other is Huang Tianle, who is also about to turn 30, but he is always optimistic and knows his fate. He is not troubled by life. He insists on traveling around the world to find love despite suffering from cancer, and he has never missed delicious food because of his slightly fat body. They don't know each other and have different personalities. Due to fate, Lin Ruojun moved into Huang Tianle's house. Unexpectedly, the two were born on the same day of the same month of the same year. Lin Ruojun reads each other's life through Huang Tianle's diary. The two women merge, observe, and influence each other in the air... Who broke into whose world?