This bro I'm 100% convinced that she's a noble and that it will turn out like that and he'll regret it really hopes he suffers! N wish her the best honestly she needs some heal time man
This is not a spoiler. Just a theory. Here’s the spoiler:
She was a mermaid who met Cesar when they were kids and became human for him. However they both lost their memories of that. For them to be together in the end, his parents will arrange for them to pretend that she’s actually a princess from some foreign land that they took under their wing, which is why she was pretending to be Cesar’s sister
THIS IS CRAZY WHAT OMG THE WATER SCENE MAKES SENSE NOW WTF OMGG
I still have the feeling she's the lost princess from the nearby kingdom because the crown prince has the same green tinted hair