Key (3 in 1)

The mission the Dream Domain issued to a Dream Seed would always be a test of the line between life and death.

However, when the others knew about what this particular line was about, they would probably understand it as the line that measured how dangerous the whole incident was.

Was it wrong to understand the line this way? No, it was not.

The level of danger was there definitely there, but there was another way to understand this line.

Regardless of the clues or battle that happened in the Dream Domain, there would always be a chance, and the line was that chance. 

The key was to grasp the line.

Grandfather Han was the first person he met after he entered the Dream Domain, then Qingxi town.

At first glance, the arrangement was perfectly fine because regardless of how authentic the dream world was, it was not real and a reasonable entry point was needed to bring Tang Ling into the world.