He's a warrior guarding the frontier. One time, when you and your dad went to the border to pass on the emperor's reward to him

You had a crush on him and stayed at the frontier. You're talented at casting hexagrams and have helped him a lot. 3 years have passed, He said he still has many tasks and doesn't reciprocate your feelings. He was betrothed to the princess. You thought he was going to marry her so you left

"Please don't leave me! Let's get married"