Sillosimbullo

Go Seon-Yeong, who was once a successful actress, has now fallen to being a housewife with a cheating husband and three immature sons. One day, she visits a fortune teller on the recommendation of an acquaintance, and receives a talisman with the words, "Your husband cheated because you've grown old and ugly. If you want to become young, have a relationship with a young lady." Seon-Yeong, who is extremely stressed due to her appearance complex and her husband's infidelity, concludes that the shaman's words, "relationship with a young lady," are "sexual relations," and ends up sleeping with the new housekeeper...

(Source: Ridibooks, translated)

Note: Part of Ridi's Jujonggwangye GL Danpyeonseon (주종관계 GL 단편선) Collection. Chapter count includes prologue.