Mu Jing was born into a wealthy family, but had a free heart. It was eight years after she gave up her status as the eldest daughter of the family that she met the person she longed for. After all, they missed each other. They mistakenly thought they loved each other, and mistakenly thought they did not love each other.
Mu Lin was originally a younger sister. In order to have a better life in the family, she exchanged identities with her twin sister and lived an upright life, but she shouldered the burden of the entire family. She married someone she didn't love, thinking that Mu Jing could take her place as his wife, but she didn't want to see her sisters live a happier life than she did, and gave up on the one she loved.
This is a war of love, and you think you are winning, but you are not.