The meteorological station is the center of the world. Five hundred years ago, the Ten Great Clans sealed the power of the weather inside machines, working together to maintain the order of heaven and earth. But that order gradually became a monopoly, and the Yun Clan swallowed up the Frost, Dew, Wind, and Thunder Clans, ruling with an iron fist.
On the day the Frost Clan fell, twenty-one-year-old Yun Shuying found eighteen-year-old Yuan Hua in a snowy forest. She was the last descendant of the Frost Clan and had the power to control every weather machine. Yun Shuying sealed her memories and took her away, pretending to be her older sister.
They depended on each other in a little building on a narrow street. Yun Shuying worked in the meteorological station's codebreaking room during the day, then brought home chestnuts roasted in sugar in the evening. Yuan Hua waited for her to return. Their days were as quiet as snow falling into hot water, silent and imperceptible, yet warming the heart.
That summer, Yuan Hua enrolled at the Meteorological University. Frost flowers formed in her hands during class, and iridescent light danced across her fingertips. She began to realize there were too many things about herself that her sister had never told her. Fragments of her memories were rising to the surface, one by one.
Meanwhile, Yun Shuying still sat in the codebreaking room every day. The desk across from hers had been empty for five years. Deep in her desk drawer was a faded old photograph of two young girls: one was Yun Shuying herself, and the other was a young woman with black hair.
That girl had once called Yuan Hua "little sister," too.
That girl had died on the day the Frost Clan fell.
But all three of them believed that this world "would see clear skies."
