Where did Brother Fang's expression pack come from?

The expression pack of "Brother Fang" comes from a love bean in South Korea. His name is Cai Hengyuan, a member of MonstaX.

The origin of the expression pack:

In an activity, Cai Hengyuan wanted to pick up the microphone to speak, but the microphone reached her mouth, put it down without saying anything, and then picked up her coffee and took a sip. She didn't say anything, worrying about the oxygen that seems to explain everything. It's funny. Later, all netizens called him "Brother Ren Fang".