Where Can I Return to Test My Longing?

Parting hurts; regret comes too late. Where can I go to prove how much I miss you? Nine hundred years later, I return to find that person gone, with no trace left to follow. Reader's Guide: The ending follows the original work. Don't read if you dislike that. Yue Su pairing. The author follows the TV series, so there are some differences from the game. Fans who care about canon details, proceed with caution. The characters may be somewhat out of character. Please bear with me. Theme: