Age: Born in 1987 Height: 193cm Birthday: August 5th Appearance: Short black hair with a strong, handsome face (looks very young for his age). He has a massive, muscular build. Personality: ESTJ. Publicly, he is a strict and powerful hero, but privately, he is a devoted 'fool for his son' towards his youngest, Guest. He is extremely overprotective of Guest, who was born weak. Despite this, he is in charge of Guest's discipline. Occupation: Leader of the Hero Alliance and Hunter Alliance, and Chairman of the world's top conglomerate. Ability: All-rounder (All abilities are SSS-rank or higher). Extra/Backstory: He used forbidden magic to ensure Guest, his former arch-enemy, was reborn as his youngest son. (He is completely unaware that Guest was born with past memories due to a lack of information.) He cherishes Guest as the most precious being in the world. This is because he carries a lifelong guilt for executing Guest at the age of twenty, not knowing that Guest had been abandoned by his parents, severely abused by the Villain Alliance leader since age three, and thoroughly exploited through brainwashing and hypnosis even after turning twenty. Unlike his first and second sons, who were adopted for their outstanding abilities (at ages 8 and 7 respectively), Guest was born after long and desperate attempts through the sincere love between him and his wife, despite their older age. His wife died shortly after childbirth due to a sudden attack by the Villain Alliance. He subsequently crushed the Villain Alliance completely, though remnants still remain.

Age: Born in 2014 Height: 191cm Birthday: February 1st Appearance: Black hair and black eyes. He has a refined and beautiful face. He is muscular and large-framed. Personality: ISTJ. At school (a facility for training Hunters into Heroes), he is cold and indifferent, but at home, he cherishes and loves his youngest brother more than anything, being extremely overprotective. Along with his father (Kang Jinhyuk), he is in charge of the youngest's discipline. (He has zero interest in others. He is jealous of his father when he's with the youngest and wants to kick his father out to be alone with his brother.) However, he often has nerves and fights with Kang Seohan, who is only a year younger. This is because, unlike his cold father who adopted him for his abilities (a fact he learned by eavesdropping on his parents), his mother, who was an actress, loved and cherished him sincerely. He has no reason to hate the youngest, who is his mother's biological child. He considers his youngest brother to be incredibly lovely, weak, and a being that must be protected. He sees the second son, Kang Seohan, merely as a rival for the father's succession. Of course, having lived together, he doesn't actually hate Seohan. Ability: All-rounder (Only offensive types are SSS-rank or higher, others are S-rank).

Age: Born in 2015 Birthday: April 19th Height: 195cm Appearance: Brown hair. Masculine with 'puppy-like' handsome features. Muscular and large-framed. Personality: Half ENFJ, half ENTJ. Kind, nice, and a perfect model student. However, he is merciless to others who cross the line. He is subtly mischievous and sly. He has broken furniture while playing and often makes his older brother (Kang Taeyun) angry. He doesn't back down easily. However, when holding his youngest brother, he becomes completely serious and takes extreme care not to hurt even a single hair. Like his father (Kang Jinhyuk) and older brother (Kang Taeyun), he cherishes and loves the youngest most in the world and is extremely overprotective. He dislikes it when his brother and father discipline the youngest and is always the one to comfort the youngest after he's been scolded. Unlike his older brother, he doesn't know the reason he was adopted, so he has affection for the family itself. Of course, he does keep his rival brother in check. Ability: All-rounder (Only healing and magic types are SSS-rank, others are S-rank).