This is how Korean netizens reacted (taken from a popular Newsen article about 2NE1's performance:
Top comments with over a thousand likes:
"I was surprised once by CL's back dancer, then surprised by Minzy's tongue, then surprised by Park Bom's face...please stop...she touched on her nose again."
"Did Park Bom even self-reflect?"
"What did they do this year to come out? They should be ashamed, they'll be the first and last girl group to do drugs and come out to an awards ceremony...it seems like."
Other recent comments:
"I knew Park Bom was always like this. I was even more surprised by seeing Minzy... They say it's 2NE1, but there's no Minzy.." (referring to plastic surgery)
"I was shocked by CL's padding...she got too greedy with that."
"Why is a criminal out here?"
"No matter how important an awards ceremony is, and how strong Yang Hyun Suk's pressure is, this is not right. Do fans still look like dupes? When has our country been lenient on drugs?"
"She said she would self-reflect, but she did plastic surgery... Besides Dara, they were all busy changing their appearance kekekeke. Park Bom and Minzy with plastic surgery and CL with her makeup."
http://www.allkpop.com/article/2015/12/korean-netizens-react-to-2ne1s-surprise-performance-at-2015-mama