After a car accident, business rivals Gu Tingchen and Shen Yuan both travel back in time and become Xiao Huai, the notorious wastrel heir of a marquis's household, and Lu Qingyuan, his nominal wife, in ancient times. Facing an old poisoning case, enormous debts, and Xiao Jingheng's secret schemes, the two join forces to investigate the case and restore the marquis's household using modern business strategies. Amid their constant clashes, they become each other's most reliable partners and quietly fall in love.