Not an official description, just that no other site has uploaded one yet and I figure SOMEONE will have to, so here's my basic take after 2 chapters.
MC lives in a Korea where dungeons and monsters spawn (best I can tell he has no living family). Through a loot drop in chapter 1 he earns a class, and to the surprise of no one who has read the title, it's Druid.
The problem is that while Druids can fight like a warrior, cast magic like a mage and heal like a healer, it is not particularly great at any of those (basic jack of all trades). He's not mistreated by his coworkers because of his lousy job, but no one (including the MC) has any high hopes for his future capabilities based on which job he got. While it's better than nothing, as far as anyone knows, it really is the worst known job.
The MC, as of chapter 2, is given a quest (presumably a quest chain) by mother earth, which will presumably unlock some of his class kit.
Also, I'm not being vague about the MC. If his name was mentioned in the 1st 2 chapters, I completely missed it.