Bi Dan didn't understand anything and was not able to speak.
On the episode of MBC weekend drama "Here Comes Jang Bori" broadcast on August 24th, BI Dan acted like she couldn't hear nor speak because of her mother Bori.
Bi Dan (played by Kim Ji Young) was clutching onto her stomach and sitting on the floor. A security guard who found her was asking her her name but she pretended that she had a disability and did not speak or act like she was listening.
The security guard thought that she looked hungry so he fed her. Afterwards, seeing Jae Hwa (played by Kim Ji Hoon)'s contact information on her ankle, he took it out and hid it. The guard said that the kid probably couldn't hear nor speak and went with the other police officers. He said, "The mother is good now. Let's not worry Now that the police officers are here, there won't be a concern for the little child about eating and sleeping."
Meanwhile, "Here Comes Jang Bori" is about the switch between a true child and an adopted child as the two get into a severe conflict. It features the story of two mothers and two daughters.