If we divide life into four seasons, the last quarter seems to be a winter, where life seems to slow down and hope that the end will not come so fast. But in the national park, a group of senior volunteers over 60 years old are particularly eye-catching and lively. Some of them continue to use their expertise in electric engineering, some started to learn about all kinds of creatures from scratch, some are so fearless they are not afraid to fall off a cliff on duty, and some pass on all their skills. These national park senior volunteers with their own wonderful stories do not regard this quarter of their lives as winters, but the best time like the splendid spring where they can spread passion and happiness to the fullest.