System: to Be Invincible, Fight and Upgrade!

The scoundrel traveled through the world of immortals, his soul possessed the beggar, and the fighting system was activated! Immortal gate? The threshold is too high! And beat me... Immortal master? People look down on me! And you want to enslave me... Scoundrel: "Don't accept it? Come on, let's fight!" Scoundrel: "I want them all to beg for mercy at my feet!" Scoundrel: "This world seems so big, but it turns out to be a planet! I want to fight my way out, conquer the world, and stand at the top of this universe!" So... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.