Chu Mobai is the crown prince of the Chu family in Kyoto. Because she wanted to repay a favor, she married into the Su family for three years.
Chu Mobai originally thought that three years could warm Su Ningxue's cold heart. But he was wrong. Three years later, Su Ningxue still didn't like herself. Although this marriage was originally a transaction. But it turns out that a cold heart cannot be warmed by time. So he decided to leave the Su family and return to Kyoto. And Su Ningxue had always thought that Chu Mobai would never leave.
It wasn't until Chu Mobai really left her that she knew she had really fallen in love with him. But by the time she reacted, Chu Mobai had already left in disappointment. It wasn't until Chu Mobai really left that Su Ningxue realized that Chu Mobai's shadow had been everywhere in her life. But Chu Mobai had already left her. Will never come back.