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The vicious cycle of the ouroboros. Life at school is bleak for outcast Hyun. But one day, she receives a letter from Jung, her dear old friend from middle school. Filled with nostalgia and excitement, Hyun begins reading the letter... only to discover that their time together was a nightmare for Jung. Where did it all go wrong?
As the earth reaches its end due to environmental pollution, it wakes their ancient sleeping guardians to exterminate all mankind. A slum-born robot pilot Kay leads a war against these guardians, for the survival of humanity.
Jung Dan Bi accidentally collides into top model Jung Ee Dun, plastering a piece of her toast onto his shirt. Not having enough time to even take the blame she ran off telling him to...
After a few years of vigorous training, Park Doyoung, who is determined to become a singer, had his debut spot taken from him the day before his debut. Yet again, Doyoung's dreams were shattered. That day, while walking back home in a daze, he noticed a red vending machine that he had never seen before, but the instructions to the usage of the vending machine was what set it apart from others. Just as he was about to take a gamble and use the vending machine, something happened.
In order to restore the earth's purity, ancient guardians that had long been in hiding rise up to destroy its main pollutants - humanity and civilization. Humans fight for survival against the "blooming flowers" that they had awaken.
An energetic, cheery high school girl named Garam was having a peaceful(?) school life until she runs into a cute boy name Lime. Trouble started as Lime and his best friend, Yuyi moves to her school and monsters start showing up and she's the only one around who can see it. What's more, Lime happens to be a prince from another world who came to this world to find his missing bride who he doesn't even know the face of. As time passes, Lime starts to feel weird around Garam......And Garam feels the same except that it wasn't toward Lime but to Yuyi...It starts as a normal school life story, but it turns to a fantasy from the late middle.