Deep in the smoke and rain hutong, surrounded by the green and gray quadrangle, Italian-style foreign building hides a clinic, which is only one street away from the bustle of the city. No matter what kind of illness, it can be cured here, as long as you are willing to exchange it with the most precious things. The attending doctor, Bai Qi, the world's demons have heard of his legend, of his divine medical skills, and even more of his struggle against the heavens in pursuit of the only place of freedom in this world - Penglai. It is said that the day the Penglai boat reappears, it will be the time of freedom for the world's demons. But wherever it passes, there will be demons running under the colorful sail flag, chasing the shadow of Penglai's sail. No one knows why Bai Qi pursued Penglai, no one knows his true identity, only that he used the name of medical care to search for "Penglai things", only know that regardless of past and present life, can touch his eyes, only one person. When the cold-faced doctor meets the passionate girl, when the mystery of Penglai is blocked by the heavenly path, all the mysteries will converge at No. 18, the clinic of Penglai in Smoky Hutong. All the stories are always because of "Penglai".