Who is the teacher of Yan Ti teaching in Jiugan Academy?

Jiugan According to official website's information about watermelon videos, Jiugan Academy is a video of calligraphy works released by a calligraphy blogger on watermelon videos, and Jiugan Academy's Yan Ti teaching teacher is Jiugan. Watermelon video helps people find their favorite videos through artificial intelligence, and helps video creators easily share their video works with the world.