The Masi people value only two things in a lover, strength and dominance. Prince Kim Heechul possesses neither of these things. Despite his royal status, no warrior will agree to marry him. Desperate to find his son a husband, the Masi King makes a deal with a neighboring kingdom. Choi Siwon is the personal guard to the Mountain Prince, Kim Kangin. Despite the bold stories about Kangin's strength, the first son of the Mountain King is a spoiled weak man. When his father agrees to marry him off to a neighboring kingdom, Kangin will do anything to get out of the deal, including sending Choi Siwon in his place. If the Masi discover that the prince they wanted it actually a slave, war may break out between the mountainous San and the fierce Masi horseman of the plains.

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