Reborn as a system (yep literally the name XD) it's a bl tho and so far it's interesting. Check it out if you want but I have to warn you that the translation is Lil slow you might have to wait for updates
The Duke’s Eldest Son Escaped to the Military This Bastard is Too Competent (The above two the protagonist has no system but is reincarnated with past life skills) And, Superstar From Age 0