The family of Tinja, a 12-year-old girl, is perfect, according to a vlog created by her mom. The well-groomed house and the facial expressions of family members like the models in the advertisement show that they are happy. But looking at the mother who had an affair with another man, this is not the reality of this family. A crack begins in her narrowly balanced family when her mother kills a bird that has entered her home. The next day, Tinja finds a bird egg in the forest that the bird may have laid and brings it home. The egg grows astonishingly, and a monster half-human half-beast comes out of it. Named Ali, this creature uses rough gestures to break through the thin cracks in the egg of the modern family, revealing the hypocrisy and the repressed girl's psychology in it. [MOON Seok]