In 2023, dungeons appeared all over the world and people called themselves "hunters". 50 years after the emergence of these dungeons, in 20XX, all dungeons were destroyed and that day was called the "bloody apocalypse". At this time, all the monsters and immortals attacked the humans. The hunters barely managed to stop the first attack, but the second attack became even stronger and the world's strongest hunters began to die one by one.
Meanwhile, a hunter group emerged elsewhere, and its members were known as swordsmen, mages, assassins, and tanks. The members of this group were trying to fight against the monsters that remained as members of the group alone, after all the hunters around them had died. However, at one point, a member of the warrior group finds a very powerful item and sees members of the group taking the item. Meanwhile, a herd of monsters comes and just when they all think they are dead, the assassin attacks the warrior with a poisoned dagger and the warrior's movements slow down.
Just as he is dying, the warrior uses the item he received, but the item enters the warrior's body and a tattoo is formed. Just as the assassin is about to die, the beating has no effect and he kills the warrior out of anger. The tanker stops the assassin's attack and asks, "What are you doing?" he says. The assassin says, "I don't need to kill him anymore" and walks away. The tanker checks the warrior's status and the mage completes the scan spell and learns the events.
Using the purification spell, they cure the poison and continue on their way, when they see a cave and enter, thinking, "Maybe we can find something there." After a while, they find a door and enter. There is a strange looking boss-like monster there and the door is forced closed. Unable to escape, they are forced to fight and the tank blocks the boss's attack. However, his shield runs out of durability and the boss uses the gap to attack to find the warrior's weak spot.
However, this does not work and the sword breaks. The boss waves his hand as if mocking the warrior and pins the warrior to the wall. Just as the healer is healing them, the monster attacks and the healer dies. Others try to kill the boss, but it takes great strength to defeat him. Eventually, the warrior finds the boss's weak spot and kills it. The tattoo is from the warrior's body. The warrior is unconscious and wakes up. The tank goes to the healer and says, "You passed away before I could explain my feelings to you, but I will make that monster pay for it." He gets angry and suddenly realizes another awakening, becoming a "Double Awakener" and begins to fight.
A hand-to-hand fight ensues, and the warrior clinging to the wall wakes up and sees and understands the events around him. While the boss and the tanker fight, the warrior also attacks. After 5 minutes, they are all badly injured and while the boss is almost dead, he uses the mana he didn't use, healing half of their wounds. Just when the tanker and the warrior are losing hope, it turns out that the healer is not actually dead, but when he is almost dead, he uses all his mana and heals them.
Then he dies and the tank experiences the second shock. He goes crazy with anger and the boss pulls out a sword almost 3 times the size of the tank from a corner of the cave. Since the tank uses too much power from his second awakening, he runs out of mana and returns to his normal state. They continue the fight, but the boss's health is low and there is hope for them.
The boss runs up in one fell swoop and splits the tank in half. The warrior makes the final move and just as he is about to defeat the boss, a shadow passes from behind and that person is the assassin. He did not go and watched their battle. He stabs the dagger into his back and defeats the boss, and they cannot find any reward in the dungeon. In fact, it turns out to be the monsters' resting cave.
When the assassin finally sees the book next to the boss's corpse, as soon as the book comes out, it enters the warrior's tattoo and the assassin becomes very angry. He goes to the half-dead warrior and says, "I never loved you. You took away what was always mine. Now I have an opportunity. I will make you taste the most painful death," and stabs the warrior's dagger first in his right and then in his left foot. Then it stabs his lung and releases all its poison. Just as the warrior is about to die, the tattoo glows and a screen appears in front of him saying "Requirements have been met." The warrior wakes up in an unfamiliar bed and regains consciousness.