I once saw a recommendation wherein the title has a word “lie” in it but it’s not You’re Eternal Lie I think the female lead has also blonde hair and the male lead has dark hair. I also remembered that she was to be married to male lead but her brother betrayed her due to jealousy. I guess she was more powerful than her brother that’s why he is jealous. I remembered both leads were in a carriage going to the male lead’s place but female lead was assassinated by her brother. She then regressed to a time where she thought her brother was only concerned for her that’s why he keeps on advising her to just live a low-key life and now when she returns back in time she realizes it was only because he only do it for his own benefit.
Sounds like My Sweet Enemy, Thy Name is Husband.
Canach Riadon — a slave who rose to emperor and the man I wed in my first life. Yet our ill-fated marriage left my family murdered and my homeland destroyed at his hands. Now given a second chance, I vow to succeed in this political marriage and save all I love... Or will his love save me first?