Lady Black-eun Uulhada

Margo Lonsdale, the wife of a successful businessman, stabbed her husband to death one day. She hid all the evidence and framed the male servant. No one suspects that Margo is a murderer. She is the quietest and most docile woman in the world. However, in the blizzard that started after the funeral, Margot was stranded in the mansion along with the mourners. To make matters worse, evidence of the murder is discovered by the sister-in-law's gloomy maid 'Peggy'...

(Source: Lezhin, translated)