Four days later, Baifuquan Park rustles with the sound of intermittent signals coming from the Longquanhao. The signal is located in the pearl of Taihu Lake, in southernjiangsu province. The train station is a good place to get a good night's sleep, because it's in the middle of a rainstorm. He's sure that the signal is coming from somewhere in jiangzhen, but he doesn't know where it is. He asks some math and science students to help him find the signal, but they won't help because they're too busy with their homework. The rain is getting heavier, and they can't keep going.