When something unbelievable happens, Christian and Charlotte swap something very important in everyone's' life, their bodies. That's not the only weird thing that's happening.
One moment can change a lot.
Imagine what it would have been like without it.
So in this version of events...
Complicated?
When your boy-best-friend (always has and always will be just friends. Defiantly)'s little sister finds out your problematic secrets before you even knew they existed.
Yes. Complicated is one word for it.