This is Empress Jeon Yeo-ju's bodyguard Jeon Jeong-guk.

Please read the original first, then read the short story. That way, you'll understand. The female protagonist is not an empress, but a student protected by her bodyguard, Jungkook. Jungkook became her bodyguard because his father told him to. The female protagonist doesn't know that Jungkook is her older brother. Please send me a text message. Byeoltaebyeotiltae Byeoltae Byeoltae Byeoltae Byeoltae