I have found an video years ago with some wing chun . The forms are different from everything I saw . They have some san sik similar to YKS and SCWC like "side punch" and "arrow punch" but the actual way of execution is different . I have asked some people here and there but no one could give me the answer. Here is the video of the forms , so if anyone knows anything , please share https://youtu.be/hbqy18QxLMc