Antonio's natural hair colour is brown, though he dies it a lot, he has dyed it black, blonde and light brown before. He rarely dies it colours that are too bright or unnatural.
Antonio dresses in a very casual way, but he still looks presentable. He buys quite expensive clothes, so they usually make him look quite upper-class.
Antonio can come across as quite arrogant when you first meet him, if you got on the wrong side of him, you would know it! Having said that, if you get to know Antonio, he is a very warm, loyal and caring person, he just doesn't really like to show that side of himself to people he doesn't trust, because he fears it will be taken as a weakness.
Antonio never really had much attention as a child because his parents mostly payed attention to his sister when she was born. Because of this, Antonio doesn't expect attention from everyone, and he doesn't expect everyone to love him, but he doesn't realise that the rest of the world expect to be loved, and he tends to hurt them without realising.
Antonio was born on the 8th of January, 1990 in Seoul, South Korea. When he was born his name was Yoon Jae-hyun but when his family moved to America he changed his name to Antonio Yoon because it was easier for other people to pronounce. In 1995 Antonio's younger sister, Yoon Bo-ram was born, she later changed her name to Ellen Yoon, when they moved. Ellen and Antonio never really got along, because Antonio found that Ellen was an attention seeker, and she only cared about herself.
Antonio attended the equivalent of elementary school in Seoul, he really liked school then because he was constantly challenged in his work and he had lots of friends. In 2002, when Antonio was twelve years old, his family decided to move to Miduna Beach in America because his father had recieved a really good job offer there. Antonio was really annoyed because he was happy where he was, and now he had to start all over again.
When Antonio had settled in more at Miduna Beach, he didn't hate it so much, though at first it was quite hard for him to learn English, he learnt in two years and now speaks it fluently. By the age of 15, he had made many friends at school and was much happier.
Antonio now studies at university to become a lawyer, but as a side job to earn more money he works at a motel in Miduna Beach called Brightside Motel. The working conditions are definitely not ideal, but it is enough to make a living. Through his work there, he met a girl called Thea Kwon, and they became very close friends, even more than friends at times. In 2014, Thea and Antonio bought a house together and they share paying the rent.
Yoon Seung-ho: Seungho is Antonio's father. They never really got along that well and his father doesn't keep in touch with him anymore because he disagrees with his career choice.
Yoon Min-hyun: Minhyun is Antonio's mother. He has never really had a strong relationship with her because she never really paid attention to him.
Ellen Yoon: Ellen Yoon (Yoon Bo-ram) is Antonio's younger sister. He really dislikes her because she is very self-centered. Ellen has grown up all her life with lots of attention and love, and she expects it too much from everyone, which makes her appear very self-centered.
Antonio is scared of the dentist, but he would never tell anyone.