Sinyeoui Yuhok

Given a three-month death sentence, Ipoh Bell, a maid, impulsively proposes a one-night stand to the Marquis' master, Awin Asta, whom she has been secretly in love with. Though she claims she desires nothing more than one night, her feelings for Awin only grow. Meanwhile, the suspicious archmage Dalton approaches her...

(Source: KakaoPage, translated)