South of Bancheng City, West Qin Province, across the Han River from Jiangwang County, the realm from the Bancheng Basin to the hinterland of Daba Mountain. From north to south, plains, hills, mountainous areas, landforms are presented in turn, the territory is densely covered with rivers, there are many mountains and lakes, almost the real Jiangnan water town. To the southeast of Jiangwang County, there is a large lake that has not yet been developed, and because it is located in the deep mountains, the economic situation of Bancheng City is far from developing to a certain height, so even if the scenery is picturesque, it is still inconvenient.

The lake is called 'Blue Temple Lake', with a surface area of more than 5,000 hectares, and there are two small islands in a radius of 200 meters. The two islands are less than 500 meters apart, but they are the deepest part of the lake. There are two small villages on the edge of the lake, each with two large flat flats. The two flat beaches are located in the northeast of the lake, and the two villages are called Donghu Village and Beihu Village.

The moon was full on the fifteenth day of the first lunar month, and in the early hours of the morning, due to the cold weather, despite the sultry moonlight, people in the nearby villages were already asleep. There was a loud bang in the Blue Temple Lake, and the villagers who had bedroom windows facing the lake saw the huge waves rising to the sky, and the splashes even sprinkled into the village.

In the end, the people in the village did not notice anything abnormal, and some good people borrowed instruments from the outside to investigate, but they did not find out anything.

In the blink of an eye, a year and two months have passed.

There are two old people in Donghu Village who fish by the lake all year round, one of them is the original surname Meng of Donghu Village, and the other is his old buddy surnamed Gao.

Recently, the two old men discovered something strange, originally the four seasons changed, and the lake water was always light green to turquoise, but recently the lake water began to turn dark from light green, but it turned into a blue like the sky, although it was still a faint blue.

The two old men seemed to understand the origin of the name of the Blue Temple Lake......