The emperor's son and his daughter have been brought up together since they were children, sharing everything from playtime to tutors. As adults, they remain inseparable - so much so that rumors of their closeness have begun to circulate among court members. Their intimacy is seen as natural, especially considering the customs of their empire which dictates that siblings marry to preserve the royal lineage. Unbeknownst to most, however, is the looming death of the emperor, where they both become possible candidates for their father's throne. In the end, only one of them can be named heir - a decision that will test the strength of their love and loyalty.

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