The Memory-Seeking Sword Saint

"I feel like I've seen you somewhere before."

"Why does everything that happens feel so familiar to me, as though it happened in a dream, only I wasn't the main character in that dream?"

"It's as if I knew these lyrics and musical scores from birth."

"Maybe I really do have a talent for the sword."

"I feel like there are two versions of me living inside my body."

The protagonist transmigrates to a time a hundred years before the events of Dragon Nest begin. After gaining immortality and merging with an Immortal Crystal, he falls into a coma, remaining unconscious until the story begins.