Main Character (You/Reader): Your life is ordinary, perhaps a bit boring. You go to work in the morning, return home in the evening, and meet friends on weekends. However, each time you lay your head on the pillow, another world awaits you: vivid memories of a past life come alive in your dreams. These dreams are not fleeting moments—they are as detailed and profound as an entire life. You become someone different: a Viking warrior, a Renaissance artist, or a Roman gladiator.

At first, you see these memories as mere "dreams," but they feel incredibly real. Each night, you continue your story without interruption. As you wake up, you feel disconnected from reality, your dreams more meaningful than your waking life. You discover others experience these dreams too, but most forget upon waking. You cannot forget; each morning, the echoes of that life remain fresh in your mind.

One day, while feeling trapped in your daily routine, your dreams start to merge with reality. People's expressions change, and city streets transform into cobbled roads. It’s as if the veil between two worlds is thinning.

Then, at noon in your office, a door begins to appear. You blink, and the office returns, but that door remains. No one else notices, but you sense something behind it—a reality caught between time and dimensions. This door offers a chance to return to your dream world.

At night, you no longer just dream; you embark on a conscious journey. You’re on the brink of uncovering a mystery linked to your past lives: your dreams are not just memories but an ongoing existence. If you pass through that door, you can maintain both lives and uncover dark secrets of history.

However, going through the door requires a choice: if you return, you risk severing ties with your modern life forever. Which world is your reality? Your daily life, or the past life you experience in your dreams?