Return of the Grand Princess

The first princess of Danria was abducted at a young age, but was saved by a mysterious man. 15 years later, she became the leader of the Mystery Pavilion. She hid her identity and lived in Quario with her husband. When the emperor paid a anonymous visit, he saw the kindness in her and appointed her husband to be the top scholar. What the first princess didn’t expect was that her husband would betray her and plan on marrying another woman. What would the first princess do?