Xinghai Jiutian

"Is this here?" Baili Feng looked around curiously. In his dream, the boy dreamed more than once about the tragic situation of the village at that time. A black figure flashed past. It was a mysterious man wearing a black cloak. Baili Feng chased after him. Turning the corner, Baili Feng came to the library. The mysterious man looked at the clock on the wall of the library... In the dream, there is always a voice guiding the boy to the library. What is hidden in the library? Is it related to that year?