In the novel, does it ever state what happened outside while yoojin was in the dungeon? I would like to know pls
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.
Their relationship is really fucking interesting. Their relationship wasn't formed due to love, friendship, or familial ties, they live together simply because they enjoy each other's company. They are able to form a strong connection and bond with each other without the usage of formal labels to title their relationship with each other. They don't try to meddle into each other's personal affairs and both don't save time in their day to properly hang out with one another.
The ambiguity of their relationship is what keeps driving the plot. The people around them are desperate for labels when they themselves don't have a clear label for their own relationship. This manga really expands upon interpersonal connections and I wonder if the mangaka will continue to keep their relationship ambiguous or will eventually give them a title as the story continues to develop. Anyways I really hope this shit gets picked up again, or even better, become officially licensed cause my impatient ass needs to fucking know what shit's about to go down
This is so peak I'm crying