Kiseop had been in an accident where the smokescreen used during an upcoming MV exploded in his hand, resulting in 2nd-degree burns and shards of the smokescreen being lodged in his body. The photo and video of Kiseop's accident had worried fans sick, and many had been concerned for his face.
He just recently posted a selfie to reassure fans. While he's still got bandages on his face and neck and he's covering the majority of his face with a pair of sunglasses, he looks loads better than the last time fans saw him.
Hopefully he recovers soon.