There are friends living in my house

2119. People develop fangs, creatures that are somewhere between animals and humans. These creatures, who initially lived as animals but then transformed into humans, are more useful than ordinary pets, and people begin adopting them in droves. Kim Nam-joon's younger sister, Kim Yeo-ju, also takes an interest in these fangs. Kim Yeo-ju visits the BTS fang adoption center to adopt them...