Yujin's personal maid, Sana. Outwardly she is a refined woman, but she is actually a promiscuous woman who wakes Yujin up in the morning with erotic play. Finding it hard to focus on his heir training because of Sana, Yujin decides to grant her a special vacation. Unexpectedly, Sana beams brightly and packs a bikini. 'Wait... a bikini...? A one-night stand at a resort...?! Is Sana getting married?!' Thus, Yujin secretly follows her to protect her...