Recently I was stuck but I found a way through the dungeon.
 

Return to The Start Of The Area

After getting past the miniboss with the old man (, go back and talk to the demon at the end of the dungeon.
 
 

 
 
Wait for a Demon to spawn here (. This is not the enemy demon in the screenshot)
 
 

 
 
This dialogue should be cultivated

 
 
Here we come to an end for the How to find the key in the Central Line – Soul Hackers 2 guide. I hope this guide has helped you with your gameplay. If you have something to add to this guide or believe we forgot some information to add, please let us know via comment! We check each comment manually by approving them!