Despite his unfortunate family background, Cha Yoon bravely passed the medical school and began a relationship with his senior, Dohyeon whom he had a crush on. One day, he is kidnapped by a mysterious group, and Taekang Construction Director Sung Taebeom appears in front of Yoon. He suddenly asks Yoon to pay off his father's debt of 3 billion won... "Choose. Will you fall into the abyss with your father, or will you live your whole life by my side?" Yoon, who has lived a life without choices, faces another ordeal. Is it really okay to continue staying by this man's side?