Responses
Me too!
No, it was never revealed what happened and Yoohyun only said that he overreacted (obviously a lie).
But you can probably take a guess from that. My theory is that Yoohyun was acting desperate trying to reached the dungeon while having those severe wounds on his body and the others saw how he dragged his body to the dungeon while chanting his brother's name.
Oh I see
In the novel, does it ever state what happened outside while yoojin was in the dungeon? I would like to know pls