Wrong Marriage, Unspoken Love

Princess Song Wanxin refuses to marry the Prince of An, forcing her identical twin sister Song Xiaoyu to take her place. Two years later, when Song Wanxin becomes the princess consort and sees Xiaoyu favored by the Prince, she threatens her mother's life to swap identities. Undeterred, Xiaoyu returns to the princely mansion as a maid to thwart the scheme, causing the plan to fail. Upon learning the truth, Prince Chu Qing does not anger but declares his feelings, eventually uniting with Xiaoyu.