Oh and to your edit: I wasn't as much worried about the beginning more the way she reacted to the rain.

Also as someone pointed out to me:

"That Soyeon chick totally just threw a monster donkey dong into our chronology by having her arrive late in the day. It's supposed to be morning that everyone arrives.
She won't be able to join until laaaater, and therefore won't know ANYTHING that's gone on. That also puts her at a disadvantage for character development; unless she goes to school at night and doesn't sleep?"