I love you
Description :In the BLUE KINGDOM,where people can say "I Love You" only once in a life time.Saying these three word will cost a price, which is you have to stay with that one person forever and they have to love you back. But if they didn't return the feeling,you will die. And it doesn't end with just death,your soul will trap in the dark place and getting punished until there nothing left in you.
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In which jungkook meet taehyung after being transfer to the earth after turning 18 years old.