Two girls, both abandoned at the entrance to the town clinic, grew up together in an orphanage: Xiao Wei and another girl named Xiao Wei. They would lean on the windowsill to watch the old locust tree, plant mung bean seedlings beneath the wall, and promise never to part. But one summer, someone came to adopt a child. The nine-year-old older sister chose to be taken away in place of her sick younger sister, leaving behind a note.
For fourteen years, the younger sister stayed at the orphanage, drawing countless pictures of the old locust tree. She grew up waiting, left the orphanage, entered art school, and became a cleaner to make ends meet. The older sister became a doctor in her new family, yet remained entangled in the secret of her identity and her loneliness. The two passed each other in the same hospital: one pushing a cleaning cart, head bowed as she mopped the floor; the other walking by in a white coat, head held high. Then a note bearing a picture of the old locust tree was slipped through a door from the corner of the cleaning cart. Following the branches of the tree from fourteen years earlier, the handwriting precisely found its way back to the other person's name.
After reuniting, they discovered that their separation had concealed an even deeper secret: the adoption records had been altered, the truth of their birth was different from what they knew, and an anonymous report was bringing old events back to light. Facing an inheritance dispute and a crisis of identity, they supported each other and found their own paths. One went to a mountain village to work as a community doctor; the other used her brush to record their shared memories. The story begins with the old locust tree and travels through cities and mountains, across letters exchanged over decades, finally coming to rest beside the osmanthus tree they planted themselves. The one who waited at last found the person she had been waiting for; the paths that had diverged joined again beneath the same moon, their roots connected once more.
Theme: Those who lose their way will reunite at the roots
