Cliché story that everyone knows about regressing and portal/dungeons. The protagonist had potential but upon regressing becomes the typical cocky solo-leveling like hero. The world-building is absent, the author just assumes you know gates, portals & dungeons from other manwhas. The protagonist gets power-ups upon power-ups, so much so that the power-scaling is hard to understand after 15 chapters. It also kills all kind of rewards since it is extremely easy for him to get new skills that he can even combine between them making them all the better. On the good side the art is good and it's a formula that kinda works. The pacing isfine.

I would recommend it if you have nothing else to try.