the original novel our MC transmigrated into is called Return of the Hunter Who Died 999 Times. a male MC devastating tragedy revenge story. the protagonist ML, an F-rank hunter, entered the tower and suddenly a bug occurred. he couldn't get out and every time he died, he regressed to the day he entered the 1st floor. he spent years inside the tower to clear it and get out.

In the original story, he regressed 999 times, killed the dragon boss monster then went out. he kept himself low-key despite already becoming an S-rank due to his regressions, but then his friend died taking an attack for him and he vowed revenge.

... though now that MC is here, the genre change entirely into healing slice-of-life.

personally, I always have soft spot for an 'entire genre change' trope like this, especially if the original story have no romance, but after MC is there, there is romance (even if it's a very small subplot). I don't mind the usual 'transmigrated into a romance novel' trope with an og!FL, but I actually prefer it if there's no og!FL, and only when MC transmigrated or reincarnated that the genre changes (something like I Will Just Stick to the Main Character & A Fake Holy Mother in the Zombie Apocalypse).

barely saw novels like this, which is why this novel caught my eye when I accidentally stumbled upon it (hehe as I said this review is so biased).

• human x non-human. there are many non-human female lead shapeshifters, yes, but what I particularly prefer is human (ML) x non-human (FL). nevermind this, this one is my personal preference.
• MC's true identity and the secret behind her transmigration. regarding transmigration stories... I always felt slightly iffy with them, because sometimes I wondered about the fate of the original owner of the body and kind of feel bad for their family. that's why depending on the plot, I usually prefer if the body they possessed turned out to be their original body... and this story is actually in that category. I haven't gone as far but I believe MC's memory was tempered.
• ML isn't domineering, nor is he the usual heartless cold ML normally seen in this genre (you know, those grand duke or tyrants usually seen on romance fantasies). he's just a poor soul who become emotionally numb due to his regressions, lost his goal and depressed, not knowing what is the purpose of living anymore. I pity him yet I personally like this kind of ML better. after all, this is an animal therapy healing story.
• MC's personality is so fun. I really like it when she saw a smartphone and wondered if she could read webnovels here too lmfaoo, she even secretly look for the webnovel app on ML's phone. other than that, MC also get angry at others who belittle or hostile towards ML, frequently pranking them (like making them slip or stealing their wig...)
  
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since now it's only the beginning, it might be very subtle, but don't you guys feel that MC accepted her life as a dragon very easily? she complained she didn't care if it's romance fantasy or modern fantasy as long as she doesn't need to work. she accepted her life as a mascot and ML's pet. that's actually the reason why she can't become human. she has no desire to become one. she feels her life as a hatchling is good enough.

another thing, usually when non-human FL could change to human they rarely went back to their non-human form, but FL here actually went back a lot.