Matthew Franklin wakes up in a new world as Park Jason Gabriel, the illegitimate son of a wealthy South Korean family. After his mother's death, he moves in with his paternal family, where he faces humiliation and the burden of his hidden status. At thirteen, he endures a difficult life until he leaves for the States, only to be forced back by his family. Now, he must take his older brother's place in an arranged marriage to Kim Seo-yeon, an heiress facing a crisis. Bound by tradition, the marriage is non-negotiable, requiring them to stay together for at least three years. Jason must navigate his new and unwanted life under these circumstances.