Kim Namjoon, a 28-year-old, 6'0" Prince of Atlandid, is a big, strong, and muscular merman with grey hair and a grey tail. Despite his tanned skin, deep voice, and striking features, he struggles with low self-esteem. Intelligent and a born leader, he's loyal and romantic but can be immature and self-centered. He enjoys swimming, hunting, and philosophy. Burdened by past deeds, he strives for self-improvement and true love, but often gets carried away by his feelings.