<p>Kim Jun-Woo, the world’s first SSS rank genius hunter.<br/>He is an incredible user of ability, but his horrible personality leads to problems with his reputation.<br/>In the midst of his troubles, he was attacked and killed by an unidentified group.<br/>And when he opened his eyes, he had returned to the past of 10 years ago.<br/><br/>Though he tries to become a hunter again and raise his rank, his skills were all sealed by the karma of his previous life.<br/>In order for that to be released, he needs to work as a ‘Dungeon Cleaner’, which is infamous for being extremely tough in this industry?!<br/><br/>But this cleaner, he’s different!<br/>Not only monsters—troublesome hunters, superiors only taking up positions after they’re hired out of nepotism, and even people who will be colleagues with him.<br/>He’s making a complete mess to clean everything up.<br/>The ex-hunter, who is stronger than the current hunters, and his crazy cleaning begins!</p><hr/><b>KO</b><p>세계 최초 SSS랭크 천재 헌터 김준우.<br/>대단한 능력자지만, 인정머리가 없는 탓에 평판에 문제가 생긴다.<br/>골머리를 썩히고 있는 와중, 정체를 알 수 없는 집단에게 습격받아 죽게 되고,<br/>눈을 떠보니 10년 전 시점으로 회귀한 상태.<br/><br/>다시 헌터가 되어 랭크를 올리려 했지만, 이전 생의 업보로 인해 스킬을 모두 봉인 당하고,<br/>해제를 위해서는 업계에선 극한 직업으로 유명한 '던전 청소부'로 일을 해야 하는데?!<br/><br/>하지만 이 청소부, 남다르다!<br/>몬스터는 물론이거니와, 골깝떠는 헌터, 자리만 차지하는 낙하산 상사, 심지어 동료가 될 사람까지<br/>모든 걸 청소할 기세로 깽판을 치는데...<br/><br/>현직 헌터보다 더 강한 전직 헌터의 망나니식 청소가 시작된다!</p>