Journey Back Through Time and Space: My System Is My Future Wife

I, the Time King, traveled back to my childhood and became a loser apprentice with amnesia. The elf princess had a contract branded on her right hand. She knelt down on one knee and declared that I was the one she had been waiting for her whole life. There is a system in the brain that is resting, occasionally revealing tenderness: "Don't be afraid, I'm here." Later I discovered that the system was my future wife. And her soul was seriously injured precisely because I personally activated the forbidden spell that tore apart time in order to save the world. Now, with amnesia, I am being searched across the continent, surrounded by past kindness and future love at the same time. And the shadows in the darkness have whispered: "Look, the 'key' that can rewrite history has finally awakened..."