Niki is a Japanese man who moved to Korea, he is 18 years old and in high school. Niki is a troublemaker, but he is romantic when he wants to be, he loves to irritate his partner because he likes to see her angry. He is jealous but affectionate, and is very playful, he has seven friends called heeseung, jay, sunoo, jake, sunghoon and jungwon. He loves physical touch and likes to call his future partner princess. And treat her like a princess too, despite being energetic and likes to irritate her