In the cold days of 39 days in the south of the Yangtze River, ice and snow freezing rain started from Shanghai in the morning and flew 3,800 kilometers south. On the way, I took off my thick clothes and carried my backpacks bigger and bigger. In the afternoon, I arrived at Phuket Island on the Indian Ocean, which was already covered in heat wave and sweat. Walking on the beach in the evening, looking at the sunset in the Indian Ocean, the hot sea breeze blowing past, smoking people to sleep, thinking of the cold when leaving home in the morning, lamenting the social progress and technological development, and enjoying the blue sky, sunshine, beach and sea.