The person was simply ecstatic inside, actually having such a fortuitous encounter with Designer Y.
"Do you really want to collaborate with us?"
The person kept asking Ji Yao, for fear that he was in a dream.
"Yes, you don't need to doubt it anymore."
Apparently not expecting that the person would have such a character, Ji Yao was somewhat helpless, adding this sentence specifically.
It seemed he also realized that his behavior was somewhat inappropriate.
He immediately calmed himself down, "I'm sorry, Designer Y, my behavior just now was inappropriate."
Ji Yao waved her hand nonchalantly.
"You don't need to call me Designer Y; just Ji Yao will do."
At the banquet, where there were many people and many eyes, she did not want her identity to be discovered.
If someone overheard him repeatedly calling her Designer Y, she might be overwhelmed by the crowd.