Jin sees the Shadow Lord's Castle, sees several shadow soldiers around the castle, and uses his shadow copies to defeat them and advance.
There is a giant guard at the door of the night castle, and Jin attacks him with his shadows. To test his newly learned ability, Jin combines all his shadows and enters shadow form himself.
In this form, Jin uses his shadow slash, causing the guard to split in half. However, the door is invulnerable and only those with shadow powers can open it. There is a handprint on the wall and Jin puts his hand there, releasing his shadow powers and the door opens.
There are a lot of shadow soldiers inside and Jin secretly cuts them down and sees the shadow lord's door. There, the shadow commander is there and Jin clashes swords with him.
The shadow commander cannot stand because of the pressure and is brought to his knees. Jin beheads him and goes inside. The shadow lord says, "I've been waiting for you," and creates a sword from the shadow and begins the battle.
During the battle, the shadow lord's sword sometimes ignores the sword and passes through it, injuring Jin. Jin enters his shadow form and begins to fight, and the shadow lord takes off his cloak and accelerates.
The swords collide and Jin wounds the shadow lord with his shadow slash. By gathering all his shadow power into a single point, he strengthens his sword and focuses on the final attack.
Jin combines his shadow power with his mana and everything becomes clear in the final attack. When swords clash, everything around is destroyed
Jin was seriously injured during the battle. That shadow lord thinks he's won. Jin, on the other hand, secretly dealt his final blow and with his silent shadow sword skill, he felled the shadow lord to the ground with his arms and legs cut off.
Jin barely gets up and kills the shadow lord. His profession changes to "Shadow Lord" and as he becomes the new shadow lord, he revives all the soldiers who died in the night castle.
All soldiers obey Jin and become his shadow army. Innovations have also been unlocked and Jin can steal people's shadows and take their form. However, Jin becomes stronger than the original over time.
Additionally, Jin also obtains the shadow sword. This sword can form anywhere and from any shadow. After leaving the dungeon, Jin receives a message on his phone.