Kim Jun Myun and Kwon Ru Mi made a promise as a kid that they will be best friends till the end of their life and keep their brother-sister relationship even if they are married to their love ones before she move to Jeju Island. They even promised not to marry each other if it is an arranged marriage set by their parents because they know how their moms are. After 15 years, both of their moms met each other by chance in a bakery and decided to arrange their kid