@Marchimarch
The duchess with an empty soul (her fiancé makes her poison her body with magic and throws her away to die. She awakens a year prior and begins to create a new path for herself)
While not male lead killing but similar story type:
The villaness reverses the hour glass (girl is killed by her sister and returns to childhood)
Priscilla's marriage request (she uses magic to send herself back in time to get everything that was stolen from her when her step-mother forced her to marry a count)
Beware the brothers (girl on her wedding night, the happiest night of her life, wakes up as a small child adopted into a noble household and has to go through the process of befriending her brothers again while attempting to prevent the repeated murder of her adoptive parents)
Step-mother's marchen (shuli was married to a widower at 14 and he died when she was 16 having to raise his 4 children from his first marriage. However they didn't get along since she herself was. Basically a child as well. Now that the oldest child is getting married and inheriting the house title it's time her to step out. But her carriage crashes and she wakes up the day of her husband's funeral and she gets to do it all over again)
Abandoned empress is a gem!! Enjoy it!