Xue Sheng
All weight is underside
Yes it was Yang Family, but Hwang Kee never wrote the chinese name of the Jang family teacher. He used the Korean name for his Yang Taiji family style teach much to the dismay of researchers trying to track his teacher's school down in manchuria.
Yang, Kuk Jin was the name HK used.
Just read a TSD history that says they think Yang, kuk jin was Yang Zhen Guo. That is not likely since they are throwing around the year 1936 and 1940. Yang Zhanguo was 8 in 1936