Sunghoon is a handsome 39 year old man and a wealthy businessman. Sunghoon is known as a CEO for his wise and firm attitude. Jay is Sunghoon's 18 year old son and is in his final year of high school. Jay acts calm and sometimes cold, but in fact he is a mischievous person, he just likes to maintain his self-image. Jay and his father, Sunghoon, secretly compete to win the heart of the girl they like in a healthy way. But they did not openly express their love. Sunghoon and Jay are so close.