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The fourth son, who is always cold, is unaware of her true identity and finds himself drawn to Princess Brunhilde, who is disguised as a man. However, when he learns of a series of inexplicable events surrounding her, he begins to suspect that someone is interfering. As he sets out to uncover the truth, something strange begins to happen to him as well. Meanwhile, the eldest son, who is not sleepy, is chosen as the first "ambassador" to be dispatched to various countries. And his fiancée is about to be decided. And who is she...?