When rumors get out that Jongin, the Crown Prince of West Korea, slept with the youngest Prince of East Korea, their parents claim that the two get married. However, as time goes by and Jongin gets to know the other Prince, two things happen: 1. He starts to like Kyungsoo. 2. He knows he shouldn't marry someone who's already in love with someone else.

  With no other choice, you approach an old castle seeking shelter from the rain. Prince Baekhyun may seem warm and friendly on the outside, but he seems to have a secret he's desperate to keep from you.