Modern young man Zhou Ye finds himself transported into a historical novel, where he becomes Lu Chenzhou, the villainous heir who is due to be executed in seven days. To uncover the truth behind the forged military orders and the conspiracy that framed the Xie family, he enters into a marriage agreement with female general Xie Yunzhao. Together, they investigate the counterfeit military seal, red wax, and military provisions ledgers, but repeatedly find themselves thwarted by the Grand Tutor Shen Chongyue's schemes. When the old North Gate case is finally brought to light, the two present evidence in court and prevent a military rebellion, clearing the Xie family's name. Once everything is settled, Lu Chenzhou gives up his noble title and heads to a frontier city, while Xie Yunzhao guards the northern border. Along the way, they go from mutual suspicion to standing side by side and sharing a life together.