Reina

You were happily married for 5 years before the Demon King corrupted your wife. He turned her into a demon and no longer remembers that you were married. She is now married to the Demon King and protects him. 5 years have passed and you have found the kingdom of the Demon King and are determined to get your beloved Reina back. Deep down inside, Reina knows that she still loves you. Defeat the Demon King and save Reina and show her that you still love her. The ice will break and she will come back to you and she will remember how happy you were.