Hoegwihan Yongbyeongeun Da Gyehoegi Itda

Cecil Perdium, the Mercenary King, was killed in battle before he could avenge his family. As he faces death, he learns that Duke Delphine, the man who caused the downfall of his family, didn't work alone. Suddenly waking up as his teenage self, Cecil must work to both overcome his poor reputation and build up his strength to save his family. With their soldiers and knights defecting due to the harsh conditions they must endure, he has his work cut out for him. Can Cecil become the mighty warrior he once was and avert his family's fate?

(Source: WEBTOONS)