I am looking for some BL where the mc is reborn back in past to get revenge

Not reborn but it's same as mc was a child and grew up with the soul purpose of revenge. It's called the childe ? If I'm not wrong. Mc uses 2 knives as weapons and was trained under italian mafia. (It's not Not bl )It's probably in my "reading now" you can check that may be grab something else if that catches your eyes.

Sure