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It started 12 years ago when strange portals started appearing along with monsters & to prevent those people with super powers started to appear ..After one large scale dungeon subduing mission only 4 manged to return back & one of them being Seo Chae-yoon(hunter name) , who now lives by hiding his identity with his real name name Yoon Seo ...But several people & guilds are searching for him & want him back including Quartz guild who send several people undercover in his search ..Kwon Ji Han