The fog in Lingyin Mountain has not dispersed for three thousand years. The ancient temple is hidden in the clouds, the green tiles are covered with frost, and the bodhi branches outside the Zen room are lush and leafy, with traces of time engraved on each leaf vein. During the Yongchu period of the Southern Song Dynasty, there was a young monk named Xuanqing in the temple. His features were as handsome as a pine tree under the moon, but his temper was as soft as the stream in front of the temple. When he was thirteen years old, he picked up a colorful butterfly with injured wings outside the mountain gate. Its thin wings were stained with morning dew and it was dying.