This is a story about constellations and the Forbidden City, through time and space. I've read a lot of time travel stories, but this time it's something different. The four members of University Women's Dormitory 237 traveled back to ancient times together, but it was completely different from the ancient world you know. Although there is also the Forbidden City in this world that everyone knows! What kind of encounter will four modern girls encounter if they travel through the past together? Zhizhi in Cancer, Chen Xi in Leo, Murong Zhanmei in Sagittarius, and Jian Ziyu in Scorpio. When the four girls finally adapted to the new world, what awaited them was a greater test. The former good sisters and themselves fell in love with the same man, who was still the emperor of this world. Their respective destinies opened a new chapter in a harem full of intrigues.