C107 Find a culvert

After hanging up, Gu Mohan immediately dialed Yuan Han's number. But, even after the phone rang for a long time, Yuan Han did not pick up. "The number you have dialed is temporarily unanswered. Please try again later." Such a voice.

Gu Mohan was not satisfied, he continued to call Yuan Han many times. However, the results were always the same. Gu Mohan sighed helplessly. This time