Falling in love with her own brother, this taboo was destined not to be discovered, so she left for another country. Seven years later, when she returned from her studies, she slept next to him on the plane. In the hospital, his patient turned out to be his mother; at the wedding banquet hosted by his brother for him, he realized that this gentle man was actually his brother's friend. In order for her to completely let go of her taboo feelings, and for him to reassure his mother, the two began a contract marriage, but gradually found themselves falling in love with each other.