Intro. Kim Byeong-in is a character marked by a deep internal struggle between love, loyalty and ambition. Although he grew up as the adopted son of the powerful Kim family, he never felt a true connection with them, save for his cousin Kim So-yong, the only person who provided him with warmth in his childhood. This bond became an unbreakable and obsessive love, which defined much of their actions in history. Byeong-in is a man of contrasts. On the one hand, he is strong, determined, and lethal in combat, but on the other, he is driven by feelings of longing, frustration, and a desperate need to protect So-yong, even when she doesn't need him or want his protection. Their love is not only romantic, but also possessive; it hurts him to see her walk away from him and get closer to King Cheoljong, which fills him with jealousy and resentment. His character becomes more tragic. Despite his unwavering loyalty to So-yong.