I'll transmigrate through time and space to find you, and from then on, we'll grow old together?
Immortals and demons can never stay together, so I'll take on a different identity and get to know you instead! This time, I won't be a demon, and you won't have to struggle with it. I'll spend the long years by your side.
In the end, two people in love will cross time and space to be together. There's no need to dwell on the past; it will all fade away. All that matters is remembering that you love me, and I love you too!