Su Xi Mu
Su Xi Mu, known as Suzie, is a high ranking member member of the Mountain Cloud Boys group within the San Fierro Triads and helps operate the Four Dragons Casino in Las Venturas. He is Wu Zi Mu's assistant and helps guide him in his daily activities. Due to their similar names, it is possible Wu Zi Mu and Su Xi Mu are brothers, but this is not elaborated on in the story.