Shen Yimo, a little fox from Qingqiu, carries half of a tattered cultivation manual and stumbles into the Red Chamber Inn, which stands at the border of the Three Realms.
Every guest here is an oddity: the black panther innkeeper, transformed into human form, is always polishing a rusty sword behind the counter; the snake demon in a green robe has a fondness for osmanthus cakes; even the old servant sweeping the courtyard is a tortoise immortal with a thousand years of cultivation. And the man in white, whose robes are as pristine as snow, always sitting by the second-floor window, is the most inscrutable of them all.
His name is Lu Chenyi, an immortal said to have ascended long ago, yet who has chosen to live here in seclusion. From the first moment Shen Yimo sees him, she senses a warmth beneath his cool reserve that makes her heart itch. She secretly follows him to learn his breathing techniques, and slips a wild fruit into his tea while he meditates. She doesn't know that this innocent closeness has already tied a red thread between them, woven by fate.
The Red Chamber Inn is no ordinary place to rest. The guests who pass through its doors carry their own tribulations in their packs: a wolf girl who trespasses in a forbidden land to save her people, a crane immortal who loses all her cultivation after falling in love, a tree demon trapped in memories by its inner demons... Following Lu Chenyi, Shen Yimo is drawn into these strange and fantastical trials time and again. The fox who once knew only a few cheap tricks gradually learns to take responsibility and protect others.
But immortals and demons follow different paths, and the Heavenly Dao shows no mercy. When she is finally about to face her last ascension tribulation, and Lu Chenyi's past is revealed alongside a long-buried catastrophe that once engulfed the Three Realms, Shen Yimo finally understands: becoming an immortal may not be difficult, but holding on to your true self through countless trials and dangers is...