Of course, Zhao Hai had not been idle in the past three years. Besides monitoring Bai Zhiyun and studying the heaven and earth runes, most of his attention was still on the ice field.
However, Zhao Hai's method of monitoring the ice field was a little different. He had already sent the mercury needles to the ice field. The mercury needles were just like a camera. Zhao Hai had no thoughts, so he would not be affected by any malicious intent. Thus, Zhao Hai had placed the mercury needles in the ice field.
