I am back to exact revenge and enjoy my harem

it is the story of a boy who after experiencing harsh betrayal set out on a journey to become the strongest and take revenge on them ...but life had some other plans for him as he died and gets reborn back in time with knowledge loaded from the future.....follow Aleck as he creates a group of talented girls under him who become superpower in the future to exact his revenge ...... also follow him as he enjoys his harem with a little matured content...