In AD 621, five college students were transported to a deserted village by a flash flood. On the ruins, finance students calculate people's hearts, architecture students build earthen walls, agricultural students breed wheat seeds, medical students rescue the dying, and computers create cloth structures. Starting from a well, a seed, and a wall, they built a city in seven years, and transformed themselves from survivors "seeking for survival" to people who "protected the land". This is a story about construction - planting hope in ruins and keeping people's hearts in troubled times
