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Lokheun’s name means "happy morning," but her life takes a tragic turn when her mother is murdered and her father becomes a fugitive after exacting revenge. To save him, Lokheun devotes her life to Garyun, the dashing emperor who’s committed to right the wrongs of his father. Believing Lokheun to be a boy, Garyun is determined to mold her into an unsurpassed martial artist, even if it means sending her to hell. Their strained relationship turns into something more as Lokheun searches for the one thing she’s never had: a life befitting her name.
A businesswoman who is in her thirties, Yugyeong Seo. She's in a relationship that seems to be sinking every second. One day, her younger brother's friend, Ijun Gwon, abruptly comes into her life physically and mentally, starting an odd cohabitation. Ijun Gwon, although he is the perfect house husband material, good at all kinds of house chores, he seems to dislike treating Yugyeong as a senior. Why does he care for her so much? Why does he not like to treat her as Nuna? Well, maybe this cohabitation is rather impure.
Nama Lokheun berarti "pagi yang bahagia," tetapi hidupnya berubah tragis ketika ibunya dibunuh dan ayahnya menjadi buronan setelah melakukan balas dendam. Untuk menyelamatkan ayahnya, Lokheun mengabdikan hidupnya kepada Garyun, kaisar tampan yang berkomitmen untuk memperbaiki kesalahan ayahnya. Karena mengira Lokheun adalah laki-laki, Garyun bertekad untuk membentuknya menjadi seniman bela diri yang tak tertandingi, meskipun itu berarti mengirimnya ke neraka. Hubungan mereka yang tegang berubah menjadi sesuatu yang lebih ketika Lokheun mencari satu hal yang belum pernah ia miliki: kehidupan yang sesuai dengan namanya.