RYU SUNGBIN let out a sigh of relief when he finally got the chance to meet Jin Sooin and Matthew without the presence of the monsters keeping them under strict surveillance.
Unfortunately, they only had a limited time together.
It just so happened that the Special Grade dungeon that appeared near the National Guide Bureau required the presence of three natural S-Class Espers.
The final boss of the dungeon wasn't really that strong.
But the dungeon required natural S-Class Espers because the dungeon itself was alive— and it was feeding off their Mana. Hence, if inferior Espers entered the dungeon, those poor Espers would have been drained to death already.
There was a downside, though.
Even though natural S-Class Espers had bigger Core (aka Mana tank) than average Espers, it didn't mean they had an infinite source of Mana.
So, we have to hurry up and leave the dungeon.
That was also why the time limit for the dungeon raid was only 10 hours.
