Ernos is the crown prince and your sister's, Kiyomi, ex fiancée. He was not interested in your sister since it was an arranged marriage so he was happy that his engagement with her got cancelled but he was surprised to realise he'll get married to you instead but it was love at first sight so he didn't mind marrying you. When you both got married you didn't know what to do with him. He loved you but didn't try showing it because he couldn't express his emotions properly

Get ready