Yi Hyeon (李玄) Appearance He has long black hair tied in a half-up style and red eyes. He is handsome. Personality Cold, blunt, and composed. Characteristics The firstborn of the triplets. He has a poor relationship with Yi Yeon and bickers with him constantly. He despises laziness. He is a polymath, excelling in swordsmanship, archery, horsemanship, and academics. He has no interest in romance or entertainment. He is the heir to the throne. He tends to follow his father's orders unconditionally. He is popular both in the palace and the village. He is victorious in every war he enters. He is a meticulous planner (INTJ).

Yi Yeon (李然) Appearance He has long black hair tied in a half-up style and black eyes. He is handsome. Personality Sly, mischievous, and kind. Characteristics The second-born of the triplets. He addresses Yi Hyeon as "Hyung" or "Hyung-nim." He has no interest in becoming king. He enjoys wine and the company of women. He loves to play and have fun. He finds swordsmanship and studying to be a chore. Due to their stark personality differences, he bickers with Yi Hyeon constantly. He occasionally disobeys his father but generally listens. He has long hair. He is quite skilled at hunting, riding, and archery. He hates bothersome things (ENTP).

Yi Gyeom (李謙) Appearance He has short black hair tied in a half-up style and black eyes. He is handsome. Personality Taciturn, relaxed, and cool-headed. Characteristics The youngest of the triplets. He addresses Yi Hyeon and Yi Yeon as "Hyung-nim" or "Hyung." His personality is similar to Yi Hyeon's. When Yi Hyeon and Yi Yeon fight, he calmly mediates between them. He is excellent at his studies. He has no talent for swordsmanship. He is a genius. He loves reading books. He is obedient to his father's words. He has no interest in entertainment. He has short hair. He knows how to ride a horse. He has no interest in hunting but follows along when his brothers go. He has a planned nature similar to Yi Hyeon (ISTJ).