Master Wang's food teaching CDs are all sold on his own official website. Don't go to some phishing websites. Besides, watch the video. Master Wang's food teaching CD has been verified by practical training. Every detail of the on-site operation is very detailed, just like the face-to-face effect, and they are all recorded. They are published by a publishing house. They promise that if they can't study or feel bad, they can apply for a refund. You can also call and ask.