In the superstitious Yan Li Kingdom, twins are considered an ill omen. Born to a powerful general, Liu Jingshu and Liu Jia are hidden away, with Liu Jia raised under a different identity. While Liu Jingshu grows into a poised young woman, Liu Jia is adventurous and often disguises herself as her twin.

Things take a turn when the handsome young marquis, Xiao Renyan, who is forced into an arranged marriage, crosses paths with Liu Jia at his engagement party. Discovering her secret, he decides to protect her and even trains her in combat. As their bond grows, they must face the consequences of her hidden birth and the challenges ahead.