30 parts Complete There was a cute little characters who was abandoned by their owners the famous BTS and they live a fragile box with a encounter of a kind-hearted teenage girl named Brittle attempt to adopt them and keep them. Brittle was home alone because her parents died when she was younger, Brittle decides to name them Koya , RJ , Shooky, Mang, Chimmy, Tata and Cooky. She is now a big sister of them, her little cuticles is hungry, Brittle give them a delicious cookies made by her and keeping them as her babies she tells them to go to sleep but they afraid of the dark so Brittle decides to sleep with them not thinking about BTS. Later the BTS are looking for their precious sons the BT21 and realized that their the one who abandoned them. Namjoon is finding his koala son, Koya, Jin is looking for his alpaca son RJ. Yoongi is worried his hyper son, Shooky. Hope is crying because of his dancing son, Mang. Chim-Chim is looking for his cute son Chimmy. Taetae is lose his heart for his son, Tata and Kookie lost his muscle son Cooky. BTS finding out the girl is keeping the creatures. Later they apologize to BT21 creatures and Brittle, now BTS adopted her as their new daughter and while she is the older sister of BT21. Later in the survival show I-LAND, BTS, Brittle and BT21 appears causing the trainees non-stop shocking and screaming. Former ice skater, Park Sunghoon falls in love with Brittle after she appears. When BTS left Brittle behind, she suddenly interact with the trainees including Kim Sunoo, Yang Jungwon, Park Jay, Sim Jake, Ni-ki, and Heeseung. Brittle started to enter a relationship with Sunghoon after confessing to each other.
