Who was the master of ancient Sun Bin?

According to legend, Sun Bin and Pang Juan worshipped the hermit Guiguzi, so Sun Bin's master was Guiguzi.

Sun Bin (birth and death year unknown), whose real name is Sun Boling (genealogy can be found in Sun Shi, Shandong Province), was a strategist in China during the Warring States Period, Han nationality, and was born in Juancheng, Shandong Province. Born between A and Gan (now north of Juancheng County, Heze City, Shandong Province), he is a descendant of Sun Wu. Bin Sun, a former classmate of Pang Juan, was physically disabled by Pang Juan. Later, he went to Qi with the help of an envoy of Qi, and was appointed as a military adviser, helping Tian Ji, the general of Qi, to defeat Pang Juan twice, winning the battle of Guiling and Maling, which laid the foundation for Qi's hegemony.

Guiguzi (400 BC-320 BC), surnamed Wang, also known as Wang Li, was originally named Xuanweizi.