In the seventeenth year of the Republic of China, there are three secrets hidden in the fog in Xiguan, Guangzhou: Chen Yanzhi, the young owner of the Chen family silk and satin shop, appears to be a gentle and elegant business rookie, but in fact he is an underground information transmitter who has been lurking for many years; the newly moved The mysterious female tenant Su Manqing, who restores ancient paintings, always comes in and out of the heavily guarded consulate area late at night; and the dry well in the backyard of the Silk Manor, which has been sealed for thirty years, will emit strange copper bells every full moon. When a top-secret telegram labeled "Lotus in the Mist" accidentally fell into Chen Yanzhi's hands, his and Su Manqing's fates were forcibly tied. The two circled around in the net woven by warlords, foreigners, and spies. While gradually uncovering each other's identities, they also came into contact with an old case buried deep in Xiguan that affected dozens of lives. When the fog clears, some people stick to their faith, while others become pawns, and the secret in that dry well will eventually rewrite everyone's ending.