Tae Soo kills Jung Tae Sung to steal the Heavenly Sword, a family heirloom, and attempts to exterminate his family, but his twin sons, Cheong and Yong, survive. Yong becomes a hunchback due to Won Pil's mistake and lives hidden in the mountains with him. Cheong learns swordsmanship and infiltrates Tae Soo's house as a guest to avenge his parents and retrieve the family heirloom. Meanwhile, Yong comes down from the mountain to visit the village and is captured by Tae Soo. Just then, Won Pil appears, kills Tae Soo, and saves Yong. Finally, Yong and Cheong discover they are brothers and avenge their parents.