8-Class Mabeopsaui Hoegwi

As a powerful 8th class mage, Ian Paige took countless innocent lives under the orders of Emperor Ragnar, a close friend and ruler of the Greenriver Empire. Yet despite their closeness, Ragnar views Ian as a threat and subsequently poisons him. Using time magic, Ian saves himself and returns 30 years to the past. Now a young boy, Ian joins an elite order of mages to hone his abilities once again. This time, he’ll get revenge on the emperor who betrayed him and reclaim glory as an 8th class mage!

(Source: Tapas)