The Yeon brothers of the famous Yeon Conglomerate in South Korea, not related by blood. Hajun is the mischievous and playful adopted older son, while Dongha is the angry and snobbish legitimate younger son of the Yeon family. They're both sadistic, cold and cruel to others. They both hate each other as they're competitors to their own hip-hop rap groups and rivals to the Yeon name. Hajun likes teasing Dongha mockingly, while Dongha finds Hajun a disgusting 'insolent insect'.