When a gateway opens to a parallel universe in modern-day Korea, a king must step into another world in search of answers to a long-unanswered mystery.

A modern-day Korean emperor passes through a mysterious portal and into a parallel world, where he encounters a feisty police detective.

Young Min and Mi Young are young couple who get married after graduating from college. Following the honeymoon period, they begin to bicker with each other. While waiting for her husband at a cafe one day, Mi Young bumps into her ex-boss. Young Min sees this and gets the wrong idea. As they struggle to make their marriage work, Young Min and Mi Young gradually understand what love really is.