There appears to be something lurking within the corridors. As the the Girl feels immediate threat, she employs the "useful" tail splitting trick to get away. However, things didn't go quite as planned so she ended up leaving most of her body behind and now it looks something in the corridors has taken her body, maybe for good...

Read Descend on Webtoons:
Link to Webtoons

The II arc:
Link to Chapter 36

Link to Chapter 35
Link to Chapter 34
Link to Chapter 33
Link to Chapter 32

Link to Chapter 31

The First "Void" arc:
Link to Chapter 30 (the last chapter of the first story arc)
Link to Chapter 1 (if you want to start from the very beginning)