Puppy Master (강아지마스터)

In Aeria, a place where people from various worlds are summoned, the weak are destined to die. Lee Sungmin, a talentless mercenary, was no exception. Fortunately for him, a mysterious item he finds before his untimely death sends him back to the past. Now a 13-year-old with a second chance at life, Sungmin begins his desperate journey to become Aeria's strongest with no money or talent. Will effort alone be enough to make a hero of a boy with absolutely nothing?