Perfect Family (mattang)

36-year-old single Heo Jae-Young promises a future with Sung Yoon-Woo, whom she met at a wedding, and decides to end her relationship with Sung Ha-Neul, a sex worker she had been seeing. However, the person Yoon-Woo introduced as his son was none other than Ha-Neul. After the marriage that proceeded without a hitch, the three of them live together. Jae-Young, who usually enjoys rougher sex, feels regretful about sleeping with the cautious Yoon-Woo. Ha-Neul, who senses Jae-Young's worries, makes an unexpected suggestion...

"Dad, you still don't know how to make Jae-Young feel, do you?"

(Source: Bomtoon, translated)