The night is like water, a river flows quietly and winds forward. The mountains and trees on the banks of the river are lush and lush, stretching and undulating to the end of the indigo night sky, and the faint silver light illuminates several Han-style building ships sailing quietly on the river. Suddenly, the silence of mist lingering on the river was stirred up by intermittent shouts. A young boy rushed from a distance in a panic. While chasing the fleet that was moving further and further in the river, he waved his hand to the fleet and shouted anxiously: Han Yàn'er, Yàn'er! The river water rolled eastward, and even the several building ships were floating farther and farther away. In the faint mist, one of the cabins on one of the building ships opened the door, and a tall and graceful girl rushed out of the cabin.