Introduction to the interior of the main hall: The pagodas of the second to fourth Dalai Lamas are also preserved in the Cuoqin main hall. There are many wonderful murals painted on the four walls of the main hall, including the Hundred Lines of Sakyamuni, the formation of the human world, the cycle of life and death, etc. There is a small semi-underground cave to the east of the Cuoqin Hall, which can only accommodate one person, named "Rang Jongma". It was originally a place of retreat for Tsongkhapa and the earliest building of Drepung Monastery.