An unpredictable romantic fantasy drama about a 19+ web novel writer, Nam Ja Yeon, who possesses the female protagonist of her own novel, Seo Yeon Seo, and develops a romantic relationship with the male protagonist of her romance novel, Kang Ha Jun. Ja Yeon possesses Seo Yeon Seo but panics when she finds out that the perfect man, Kang Ha Jun in the 19+ web novel, is not her muse, Yeo Ha Jun, but Bok Gyu Hyeon of "No Gain No Love". Kang Ha Jun is the perfect male protagonist in the novel written by Nam Ja Yeon. Kang Ha Jun is the president of Seo Yeon Seo's company, GB Electric, in the novel. He seems cold-hearted but is endlessly affectionate to the woman he loves. He is the perfect chaebol man who meets Yeon Seo and learns of love. He presents exciting chemistry as he faces her sudden change overnight and their single-minded romance.