Raised among humans,  Sooyoung always knew she was different from the others, but she didnt know why other than her obvious size difference compared to the other children her age,  an sure her ears were longer and pointer than the others. For this she never had many friends, unless you count the forest critters than seemed drawn to her. Or if you counted the kids that bullied her. 

As she grows older the more questions arise leading Sooyoung to vanish in the middle of the night, to find the truth behind it all.