In Shanghai in 1931, when gunshots at the Paramount Ballroom shattered the neon lights of the Shili Foreign Market, a missing body revealed the bloody account books of three prominent families that had been sealed for twenty years. Gu Mingzhang, the fourth young man of the Gu family who returned from studying abroad, holds the architectural blueprints in his hands, but when he renovates the ballroom, he discovers the hidden pavilion in the mirror - on the yellowed marriage certificate, his mother, whom he has never met, and Governor Shen have the same lotus pattern printed on their private seals.
