Yeah, we all are seeing from 3rd person point. But she only know what she see. She can't know what's happening with her brother since even that villain his close friend, still think MC and blonde is just a little too close (not romantic).
And MC spent with all those characters since child. So, he think of them as real. Sister transmigrated after Shae died so she still thinking as game characters is normal.
I don't mean she is 100% good but she didn't deserve all those hate
Ppl are hating bec looking from 3rd person view. If we think from her side, it's very normal. I also dislike how everyone hates her.
Let me tell you one thing.
MC transmigrated first and as the villain's close family. He literally spent all his life with her. The bond between them is big.
Sister played the game, so it's natural she doesn't like villain. And she spent very little time compared to her brother and of all, beside the female lead. So, her stranger-ness to villain is natural. And she attraction to female lead is big and wants to see her in love harem is bigger.
And if u get transmigrated into a game, reaching the end is the most possible solution.
She is doing what a normal person would do from her place.
There's nothing wrong with her.