1 | 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 enter their thirties. When faced with the troubles that most women of the same age face, they choose completely different attitudes towards life. One is Lin Ruojun, who is about to turn 30. She is facing increasing pressure at work, her parents are seriously ill, and her love relationship is worthless... The sudden uneasiness makes her feel unprecedented fear. The other one is Huang Tianle, who is also about to turn 30, but he is always optimistic about his fate and is not troubled by life. He suffers from cancer but insists on traveling around the world in search of love, and never misses a good meal because of his fat body. They didn't know each other and had different personalities. Lin Ruojun moved into Huang Tianle's home by chance. Unexpectedly, they were born on the same day in the same year and month. Lin Ruojun read every detail of each other's life through Huang Tianle's diary. The two women blended into each other in the air, observing and influencing each other... Who broke into whose world?