"So, that's why I didn't receive the main quest immediately after entering this nightmare..."
A flash of realization crossed Annan's eyes.
It is impossible for a completely sealed nightmare to exist, one that allows entry but no exit. Its very principle does not support such a structure.
Every nightmare must have its exit.
And this exit is the "main quest" of the nightmare.
Every nightmare must have its main quest, and theoretically, it is possible to complete it. By completing the main quest and decrypting it 100%, the nightmare can be completely purified. At that point, one is bound to leave the nightmare... because the nightmare itself has already been disintegrated.
Just like a stacking game—a tower built by overlapping three blocks per layer; if one keeps removing blocks, there will eventually be a moment when the entire tower collapses.
