Inherited RUINED CASTLE in MONSTER FOREST, But His SYSTEM Lets Him Level Up EVERYTHING

After getting isekai’d into the exact character he created in a game, a broke gamer inherits an abandoned castle deep inside a monster-infested forest and discovers a sarcastic system that lets him grind his stats to ridiculous levels. What begins with struggling to lift his own sword soon turns him into a walking siege weapon, but a hidden message reveals his mysterious bloodline may be the key to an ancient demonic threat.