Su Qingyan, the legitimate daughter of the Marquis Defending the Country, once misplaced her trust in Crown Prince Mo Yuan and stepsister Su Qingrou, causing the Marquis Residence to suffer false accusations and disaster; she was trapped in a cold, rainy desolate courtyard and died with eternal regret. Returning once again to the age of fifteen, before the imperial edict bestowing marriage has yet been issued, she awakens completely, determined to protect her family and avoid her tragic fate. Step by step, she defuses her stepsister's schemes and distances herself from the Crown Prince's deliberate overtures. Prince Regent Xiao Yanci, harboring regrets from the past, secretly extends his help and guidance multiple times. Together, the two join forces to combat court conspiracies, break through imperial suspicion and rumors, and uncover every plot. Their enemies receive punishment according to state law, the two are wed by imperial decree, and thereafter their whole family guards one another in peaceful years.