Novelupdates has like... 3 times of this plot length translated really well and smooth. The spoilers only sound had because there's so much info to cram in. Honestly, the novel is way better...
they've simplified everything a lot and it took out a lot of, well, everything. "Transmigrator's Privilege" is the novel's title. You wouldn't regret it.
Oh but here, simplified for those few buts... huge spoilers...
Reed is Terry after dying hundreds of times... the used save disk was a device used to punish Terry one of the first times he tried to destroy the world... that dungeon was so he would live life cycles on repeat, thereotically thousands of years in hell, but death wasn't an escape because boom, save spot! It happened 16 times before our girl pops in and takes the disk, closing the prison dungeon... FINALLY letting him die and move on to the next life. That's why he hugged her- taking the disk and closing the dungeon got him out of that hell by killing him..... now... the big trick...? 17th Terry shouldn't know that........
Our Terry is far older than Reed. But yeah. You're supposed to spend like a 200 chapters learning all this kind of stuff... so no, the plot isn't really easy to put in a few lines...
I promise, it only looks like she's OP because of the current environment. It's not that she has it so easy- she's a small fry compared to what's coming. Reed could probably kill her by blinking IF he wanted her dead. She looks tough to us because her opponents so far aren't even gnats compared to her future opponents. It's like if you had cheat codes to be a level 50 at the start of a game... so the first part of the game is ridiculously easy... but you move to the second part of the game and all the bad guys are level 70+. All those crazy 'cheats' were the only way she'd ever get strong enough to have even a *chance* of survival later on.
And yeah, I swear at this point, the novel is so much better than this adaption that it's starting to feel insulting. It started pretty well, but right now it's like we're hardly getting any of the events or plot... losing all the comedy and action and personality... I don't know how future readers will understand anything since all the context is being cut out. Anyway, hope you try it!
Oh, to clarify how much I like the novel: I'm in my mud 30s and have read my whole life, seriously over a thousand physical books... from the classics like Oscar wilde and Charles Dickens to the modern biggies like Stephen King, Neil Gaiman, Nicholas Sparks... and this novel is still one of my favorite all time books. ...and it's not even finished. It's simply a really good book.

Can someone pls spoil everything to a T ive been looking for “easy to understand” spoilers all over reddit and i couldn’t find anything and since im dropping this i wanted to al least know more about Reed (hes so bbg) and the whole used disk situation Σ(  ̄□ ̄||)