The Regressed S Class Adventurers Quest Life is a Manga/Manhwa/Manhua in english language, Manhwa series, english chapters have been translated and you can read them here. Browse our collection on www.toongod.net.lv, the most up-to-date comic website available. The Summary is
Unfortunately, assassins were considered as a failure class. His class was becoming harder and harder to master the more he advanced. The class itself had a low attack power and mana, so he needed to always rely on someone else. One day, Aki encountered a dangerous monster that could wipe out the entirety of humanity. He somewhat managed to subjugate the monster, but lost his life in the process. Suddenly, he awoke and found himself having regressed 20 years into the past. He also received an additional “Bonus Quest” as a reward for solo killing the monster. With his knowledge from his previous lifetime and this “quest,” Aki resolved himself to redo everything to become the strongest adventurer
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