Tong Zhan wasn't a fool. It was precisely because of this that he knew that Zhao Hai was not easy to deal with the moment he heard Zhao Hai mention the poison he had used. At the same time, he became even more careful. Although he didn't think that Zhao Hai would be able to learn how to use the poison Dragon sect's methods to poison within three months of joining the poison Dragon sect, he still had to be extra careful.