These two people think they are Haitian. First of all, Haitian's face-to-face teaching is formal, while Du Wen's is purely a bluff. Moreover, various classes in Du Wen are not only expensive, but also charged later. This is too cheat people ... and ... you search He Kaiwen's plagiarism ... Haitian is a small classroom ... and you must listen to it before signing up for class ... to see which one suits you, and then sign up. ...