The Smoke-free City is a lonely city without gunpowder smoke. The people here once lived a simple life in a paradise. I don't know when, everything changed. I am an inconspicuous person in the Smoke-free City. In order to find my favorite master, for my beloved senior brother, and to solve the mystery of my senior sister's marriage far away. . . . Leaving the Smoke-free City, it has been a difficult journey, and I have fantasized about the ending countless times, but the results are not what I expected. In the end, no matter how the dust settles, no one knows.