Su Wen was not familiar with Lu Jianan at all. She only knew that she was a close friend of Song Zishan, but they had never spoken before. Su Wen wasn't even that familiar with Song Zishan. Their conflicts had mostly been indirect, except for the signing event in the province where they had a confrontation.
The reason Su Wen recognized Lu Jianan was because of that signing event. When he suddenly asked why she was there, she felt awkward.
Given their distant relationship, why would she ask such a question?
Despite her confusion, Su Wen answered, "I'm here for something."
After a brief pause, she added politely, "What about you? Are you here for something?"
"No!" Lu Jianan blurted out, realizing immediately how odd her question had been. Since she had asked, she couldn't take it back.