The Gamer From Mars

Han Ji-Han began to realize that he needed to train to be sure that he’ll be safe in case he gets caught up in a fight again, so he trains his fighting capability with blunt objects (he uses a baseball bat). On his way home, he accidentally slips into another combat area, having to fight his way through zombies which he later finds out were amassed souls that Hwan Seong-Gon was collecting. He then realizes that he needs to talk to his friend, Shin Seon-Il. Ji-Han assumes that Seon-Il was part of this world due to his level being much higher than everyone else around him, and his assumption proves correct when Seon-Il threatens him, due to him not knowing that Ji-Han has become part of this world.