There is a group of people who take root in remote mountains to guard the home of all living creatures. Among these silent and dedicated figures, Zhang Shuyan is the "window" that leads us to enter the mysterious realm. He uses his camera to record the ongoing natural legend….

In September, Hangzhou is about to hold the 5th World Congress of Biosphere Reserves hosted by UNESCO. In Faces of Hangzhou, in the "howling of deer", we follow Zhang Shuyan's patrol route to experience the true and touching story of harmonious coexistence between mankind and nature in Tianmushan-Qingliangfeng Biosphere Reserve.