I don't usually leave reviews but this ending made me so disgusted.
At around chapter 67 I was like "wait, is that the one were all the reviews complained about the ending", then back to this page and remembered TiredandDeadInside's spot-on description.
I got hooked by the first chapters, the beginning was pretty strong, the ML stayed grey for a bit, FL hesitating between her pushover past self, her desire to be an otaku and her duty to be a true villainess.
Even if they have been done in so many other webtoons now, they were a bunch of funny comments on romance novel clichés and how cringe the FL was finding her own novel thrown back at her.
FL becomes really OP by the middle of the story but that's also a pretty common pitfall of the genre.
She is decently smart but very emotionally (and socially) dense.
She thinks ML is just touch deprived when he's been all over her even in public as her butler almost since the start
That being said when the main leads got their relationship straight those scenes where so hot! (that series deserves a "sexually active couple" tag, in a good way).
Now comes the ending to ruin everything. Basically it feels like you reach what you would think the 2/3 mark of the story and then instead of getting a deserving extra season, you suddenly get the main characters doing a 180 in their personalities and behaviors and an unnecessarily far fetch explanation to wrap the story with an overexposed ending that belongs to another story. Not only the story of the ending is bad, the pace is a disaster, really rushed, some crucial elements dropped out of nowhere that weren't foreshadowed anywhere... while a bunch of lore elements and characters were introduced earlier on never to be picked up.
What did Kilian say to the archmage at the start? What happened to the barbarian slave? Since when did Aila switch from immune to both divine power and magic to overflowing with devine power?
Not that anyone cares but here is my version of how this story should have ended ^_^
Forget about Killian leaving the country for a timely business trip and the last time loop. Aila still manages to make Charlotte realise that she's been a sheltered princess and that she needs to start living for herself. Charlotte still rejects the crown prince and there is no more loops because the way to break the loop was for Aila to live up the prophesy from her dream and live a life without regrets, which she achieves when she confesses her feelings to Killian. You can throw a small trip to Killian's kingdom when he gets caught up by his duties, where he tells his back story himself and Aila finally reveals the truth about being the author but not the main goddess. Which Killian actually takes well because that means there is someone even above that goddess he hates that made her a fool by not respecting the goddess's world's rules (being immune to magic and divine power), and being an anomaly like Killian. To tie loose ends, throwing some convenient solution for Aila to lift the immortality curse of Killian (IDK, something like, she's a great magic conductor because not from that world, she goes to the temple and figures out a way to balance the magic level of Killian). Then same happy ending of them staying OP in the world until their natural death, but without all this nonsense of "btw she's a goddess but not the main one, one from the pantheon of gods we never mentioned, that god that was shattered in pieces and mainly eaten by her future crush". And you can explain that the people who were aware of the loop where just villains from the original stories also living with regrets, for being treated unfairly by the author.
TL;DR: chapters 1 to 63: 8/10 ; chapters 64 to 72: 2/10. I will remember this webtoon as on infinite hiatus after chapter 63.