First of all, outing someone is a crime
It's the act of coercing sexual minorities into revealing their sexual orientation
This was the situation.
A person named Kim Jaewoong was talking about how he can talk in a low toned voice or a high toned voice and that he was comfortable with both. Then Lee Sangmin starting mocking the guy's voice saying while copying him "talking like this is comfortable too~". And then he asked "so does your girlfriend like that too?". Kim Jaewoong was like "excuse me?" and was taken aback