Comment by Kurou on Introvert

@Kurou Well it isn't a spoiler but in the earlier chapters when Camilla finds the Divine beast tiger she comes to know Dorman is responsible for the soul exchange. And he mistakenly put Camilla's soul in Lee Si Ah from Korea and vice versa.

Because Camilla originally belonged to this world but because of his mistake she was transported to Korea and died multiple times in hands of her father which she doesn't remember except that one where she died on the set. And all the deaths of Camilla she saw in her dreams were because Dorman was trying to bring her soul to original body.

I hope this information helps 😊