This one is absolutely hilarious. It basically makes fun of and distorts the niche shoujo isekai/time yeeting genre. Our FL is the sister of the tragic main character of a BL fantasy novel. No matter how hard she tries to make her brother avoid his tragedies and avoid his (or her own) deaths, she fails and wakes up to find herself yeeted back in time. After at least 20 time reversals, FL finds a magic sword which basically tells her that if she fullfills the wish of the character she possessed, which is to fullfill her brother Asterion's wish, she'll be able to stop the circle. FL proceeds to have one hell of a time while trying to protect her family and Asterion's happiness. The manwha is more than just self-aware, with the 4th wall being broken every so often and characters openly and obsessively thirsting for ikemen, while trying to find the best ways to bully their enemies in the most effective way possible. 11/10.
You're All Dead if You Mess With My Brother