Liu Jing Shu and Liu Jia of the Great General's Mansion are twin sisters. At that time, the twins were regarded as a bad omen, and younger sister Liu Jia hid her identity from a young age and was secretly raised in Fuzhong by General Liu under the name of Er Gou. Although the two look the same, their personalities are completely different - one sister is gentle and generous, the other is lively and naughty, and often pretends to be her twin to sneak out of the mansion and make trouble.