Qi Xiyu is an on-site technician who adjusts the inclination of building louvers. He climbs outside the city's glass curtain walls every day, using inclinometers and wrenches to adjust the temperature of light and wind in cold buildings. Three years ago, she was an administrative assistant in the Hengyao office building and had a tepid love affair with Song Yan, the manager of the planning department. Until he chose another girl from a well-off family for a "more stable future". It was raining lightly that day. Qi Xiyu only said one word "good", turned around and resigned, swallowing all the unwillingness into his throat. Three years later, she returned to Hengyao as an operation and maintenance engineer. The louvers on the south facade of the 16th floor were all misaligned, causing cold wind to blow through her. She was adjusting the blades one by one on the lifting platform, and inside the glass window, Song Yan was standing in his office on the higher floor. The slight inclination angle of 27° can make the sunlight soft and even, but the angle of people's hearts cannot be adjusted with an inclinometer. Some people feel cool when the wind blows; some people feel pain when they see it.