As a Beginner, I Accidentally Took on an Advanced Mission

The dungeon starts, and after spending four whole months unable to get past the tutorial, you’re telling me it was an advanced quest? Yu Yan was a miserable office worker who suddenly transmigrated to another world. That would have been bad enough, but he was also dropped into a pitch-black forest where he kept getting killed instantly... Only for it to turn out that the area hadn’t even been unlocked yet? In this dungeon, where dying sends you back, is that a blessing or a curse?