Probably because he didn't enter here through normal means, he can't sense the existence of this shop.
Su Changxing can easily think of the operation method of the whole Death Rift. People who come here can gain something similar to Points by killing the demons within, exchange items in the shop to enhance their strength, and then repeat the cycle until their strength reaches a certain level, allowing them to leave.
It should be possible to leave. Luo Haoyi managed to walk out from here, but it also indicates that leaving is extremely difficult; he seems to be the only one who returned from Blue Star.
This also explains another matter.
As long as you can survive here, your strength will increase at a frightening speed.
What is the significance of the Death Rift's existence?
