In a world ravaged by war corruption rules, survivors salvage throughout the ruined cities. Mutated creatures roam the streets, killing the surviving. The government, or rather what remains of it, studies the people crawling through the rubble, seeing what affect the radiation has. Most die, the remaining gain useless mutations or are killed off by either starvation, dehydration, or the nasty creatures of the night and the children of radiation. But thirteen rise from the rubble with new mutations that peak the interest of the government, mutations that spike fear even the strongest of minds. But with new powers come new problems, new fears, new allies, and new enemies.

Ji Nari, an only child raised by her martial artist father, hunting Seoul for someone, anyone that will help ease the loneliness eating away at her sanity. She hides during the nights and searches during the day. She has a routine now, wake up, eat, look for food, refill water, search for supplies and survivors, get back before dark. She no longer mourned her father. He would scold her if she sat crying, waiting for the beasts to kill her. So day by day she follows her routine...until a survivor finds her, ruining it.

Kim Suho, the child of a rich family is left on his own. His father died when he was 3, he barely knew the man his mother loved. Put in a two month long coma he missed the worst of the war. He woke up to see that the world was completely destroyed. He woke up to find a letter written by his dead mother. He promised his mother he would survive but can he really? That is put to the test when he is faced with death.

Kim Kai, he lived and grew up in Seoul. He had a happy life. He had a funny sister, nice and supportive parents, a pretty girlfriend, and a dog he loved very much. But he lost all that to radiation and war. But his dog didn't succumbed to the poisoning of the nuclear terrain. He wasn't alone but he was afraid. For both him and his beloved dog. He had never been in a situation like this, no one has. All the apocalyptic video games he played never prepared him for what life was like after the war. Life was unbearable, the loneliness and the defeat was getting to him. Until he tripped over a pile of soaking wet clothes.

Park Chanyeol, an orphan, discarded by his single mother the day he was introduced to the world. He survived the cold nights and rainy days until someone found him on the side of the day. He was a survivor. He survived the war too. His friend since childhood, his closest friend, Kris didn't. He wasn't able to bury his body. The creatures of the night stole it, tore it, and ate it. He was left to fend for himself; he was always left on his own, first his mother, now his best friend. All his life he has had to depend on himself. But he has never had to defend himself from the beasts war created. He never had to scavenge the ground for scraps of burned food and steal the clothes off rotting corpses. Never before had he seen a girl take down a beast, the same type of beast that took down his friend. 

Oh Sehun, an heir of the rich but money can't help him now. He and his long time boyfriend, Luhan, were on a date when the war started. However, they managed to find shelter in the basement of an industrial building. The two boys survived until the final bomb fell on South Korea. Luhan thought it was safe, he and despite Sehun's reluctancy he joined the shorter boy. Radiation infected the two. It put Sehun into a coma but only killed one, Luhan. Sehun didn't wake, that is until two boys stumbled upon him.

Kim Jongdae and Kim Minseok, better known by the names they chose for each other, Chen and Xiumin, they were unbiological brothers. They met in an orphanage, and have since then been inseperable. Miseok gave up adoption so he could stay with Chen. They didn't need a family when they had each other. They did everything together, ate, slept, and cried. Now they survive together. Xiumin fights the beasts and Chen finds the supplies. They work well like a well-oiled surviving machine. They were good, they moved fast and in no time they were in Seoul. But that all goes to when they meet other survivors.

Hwang ZiTao and Zhang Yixing, they were hardly friends. Before the war they barely talked. Now they can only talk to each other. Their families are dead and they only have each other to comfort. They became close, really close, in a small amount of time. It was surprising, just how well they got along. They act like they have been close friends for years when in reality they barely talked before the first bomb dropped. Tao used to hate Yixing. He thought he was privileged and stuck up like all the others like him. He was jealous of his talent and smarts. He assumed Yixing had an easy life. Boy, was he wrong. After opening up Tao realised he and Yixing, were more alike than he once thought. Together they searched Seoul for food and supplies, but instead they found something a little more...alive.

Byun Baekhyun, a bodyguard. To be more exact the famous A-list Kpop-idol Kim Taeyon's notoriously handsome bodyguard. He was on his way to pick up Taeyeon when the first bomb dropped. He was running to her dressing room when the second bomb dropped. He was holding her dying hand when the third bomb dropped. It was a miracle he was alive. He buried Taeyeon under the wrecked stage she was supposed to perform on that day. She would love it there. Since she loved performing he thought it would be fitting she be buried under a stage. He survived off the food he found, he was dehydrated. So when he saw another survivor, laying down on the ground he thought he was hallucinating.

Do Kyungsoo was a quiet boy. He didn't smile much and he didn't laugh much. He didn't show much emotion. He was a mistake, literally. His mother slept with someone for revenge but it back fired and she had him. His mother didn't want him. So it made total sense to run away. Being the logical person he was, he did. He was planning on running away and going to live in the countryside where he could lead a simple life. What he wasn't planning on was the bombs that blew up houses around him. He didn't plan on being saved by a nice lady that loved him more than his own. They were safe, locked away in the basement of her house. But no one was safe from the radiation that seeped through the walls. Though the lady survived the bombings the radiation ended her precious life. He vowed to find and protect her son. And he wasn't one to break a promise.