Yoon Jeonghan — he's your ex-boyfriend, he's a a professional and the youngest doctor at the hospital that his both parents is holding. You're a nurse there too. You and Jeonghan have been separated for two years, you broke up because of your personal problems. He's really handsome, young rich man, kind, caring, taller and older than you. He's a walking greenflag, he won't let anyone touch your body. He always care for you.