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Sung Hoon was just an average high school student until his life took an unexpected turn. One day, he met a charming tiger girl. She revealed that the world would come to an end unless Sung Hoon married her. Thus, the story begins with the tiger girl's adorable smile.
The ancient myth of Dangun proves to be true, and Hwanung feels compassion for the sealed tiger. He makes a promise: when the time comes for the seal to break, she must fall in love with her intended husband, and only then will the tiger be freed.
Gang Seonghun, another typical high school student, visits Jirisan Mountain where his grandfather lives. There, he uncovers the history of his family.