This is a story of two beautiful sisters who are totally different. While the eldest sister, Srijitra is well-behaved and good at all the house chores, the younger sister, Salin, is stubborn, cheerful and outgoing. When their father passes away, the two has to live separately. Srijitra stays with her mother and her father’s sister, while Salin was sent to live with her grandparents out of town. So Salin gets to live her life freely and works as a librarian in a city. One day, she meets Pon, a young engineer who happens to work nearby her place, they get along very well. Later, Salin finds out that her sister has to be in an arranged marriage with a prince from Wuttiwet palace. Since Srijitra always obeys her aunt, she quietly agrees to it. Although Prince Kittiraj is not pleased with this marriage because he already has a lover, he cannot deny it. When Salin finds out about this, she makes a plan with Pon to get her sister out of the marriage. Will Salin be able to succeed, and who will get to be a Royal daughter-in-law?