
The story in a nut shell
1.Crazy uncle is the villain and experimented on them
2.MC is blood sister and twin with Litia
3.Litia sends MC to different dimension (Korea) because she was drained of power and to save her
4.Litia predicted MC's death so gave her body to her since her soul will die soon anyway
5.MC then transmigrated and possessed her twin sis' body

when she received a letter with the white doggo
Let me tell you the spoiler about the letter in order to understand what the letter is first read the spoiler which I gave in the comments below , now for the letter it's from liberta mother's brother!! He requires soul power to live and as liberta has that soul power he does experiments on her to extract it !! That's why he wrote the letter telling she survived now but he will do more experiment on her. And that's the soul reason why liberta got Raphael that soul disease.. it was because of her mother's brother!!!
Also the real villain of the story is liberta uncle!!

Guys this is a huge spoiler!!!! Lesian is FL and that villainess whose body FL has now mother!!! Alicia here is referring to FL when she hadn't got into villainess body!! Also as mentioned in the pic it's shows that both sisters were got experimented that is lesian brother required soul power to live so he experimented on both sisters to get it !! I was totally shocked by this spoiler!!

Also according to the spoiler about crown prince : our FL will tell the crown prince that she doesn't want to be emperor , CP (crown prince) takes interest in FL from that moment!!! The experimentation on both the sisters as u have read on spoiler above is revealed by the CP to the emperor!! Emperor feels guilty as he was not able to protect his children!! CP gives his title to FL to become the emperor but FL says she doesn't want to then CP tells FL child would be the emperor then!! The end
Spoiler about Ariel the real MC of the novel :I didn't saw much abt Ariel mentioned in the spoiler but it did said that she successfully married the crown prince however her child can't become the emperor as FL child will become as u have read in spoiler above!! Other male leads will not fall for the Ariel though!!
Spoiler about who the main villain of the story is : the main villain is the empress brother who is liberta uncle!! He is a crazy bastard!! However he will meet an end as a fate of the villain
Ah hell nah dont you dare blush in front of that blond thot goeun istg