Yup. It's to be expected from a shoujo manga. Lemme guess, new girl want to steal the boy away. Another misunderstanding happens. And many more.. I hope at least the new girl is not a white lotus character..
I dropped it after the first chapter, but decided to try again with the latest chapter. Are they actually siblings? Or is one of them adopted? Still doesn’t make it better, but I’m hoping they aren’t blood related at the very least.