(the art was rlly amazing not ur usual manhwa type) So the mc died in a battle and even had lost an arm like he was a normal mercenary or a soldier i think
then he regresses to when he was a teen and he has a mentor too which was a woman so initially in first life he found her inside a cave locked and her strength was declining so in that situation she took him as a disciple for some reason and then in 2nd life he goes to find her first on his own and like they become master disciple again he frees her and she teaches him but he's already mastered her stuff since 1st life ah he was like illegitmate in a noble family also i think
His master aka that woman was also very famous and strong but usually remains in a small form in 2nd life while restoring her power i think
Idk about the arm but everything else sounds like this https://www.mangago.me/read-manga/legendary_youngest_son_of_the_marquis_house/
Is this harem?
Not exactly. In the end he does end up with one of them. But not much if any romance. So no you won't have shity romance or garem nonsense
Aaa okay thanku
really??? I was kinda taken aback seeing how they drew that namgoong lady