Byung-Joon is the eldest out of 3 brothers, with great responsibility. He is his little sister’s Ellie’s guardian and strongly believes in protecting her rather than showing affection towards her. He is fiercely protective of all four of his siblings. He took over the father role, and lives in Korea with his siblings. His two other brothers are Bon-Hwa and Dae-Hyun. He assumes a dominant role within the family dynamic and exhibits a no-nonsense attitude towards his siblings.