Responses

Yeah, someone posted a link here some time ago. But apparently, a lot of readers in Korea were pissed off about Tia ending up with the Prince (I mean I get it. She has PTSD from him afterall). The author thought it was good ending (which makes kind of sense) and wrote a sidestory to make the prince more likeable but that brought even more backlash from the fans in korea.
Why people keep saying this is a tragedy? They are confusing everyone. I had to look up the ending somewhere else (from someone who actually read the novel).
For those who want spoilers of how it ends:
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In the 2nd life, the prince is still obsessed with MC (he was obsessed with her in the 1st life although it doesn't show) and thinks the MC belongs to him. The shock of her interacting with other guys and her trying to break the engagement gets him to chase her to figure her out. At some point, when MC goes training with her dad she writes a letter to the prince's rival (green-haired guy) but the prince ends up reading it. Even through MC works hard destiny keeps them meeting. Then the heroine comes and keeps trying to get the prince and at the same time tries to tangle with MC too. The heroine has also been reborn! She wants MC to do all the work so she can get the credit (so lazy and selfish). The heroine has become the villain at this point so eventually the MC blames her for all the bad things the prince did to her in her previous life (rolling eyes). After that, the MC overcomes her trauma and marries the prince. She forgives the heroine and gives a light punishment: the heroine has to stray in another country up to 5 years?!
The green-haired guy doesn't get the MC (obviously) but the issues he has with his father gets solved. The red-haired guy meets a girl and they seem to like each other.
THE END.
source: https://forum.novelupdates.com/posts/4344539/