"Yiyi, who is this? Aren't you going to introduce me?"
Chen Min reacted quickly, smiling at Su Yiyi and already analyzing the situation in that brief moment. She figured out that Li Yifei was Su Yiyi's boyfriend, but also Michelle's boyfriend, clearly playing both sides. Revealing it now would certainly embarrass Su Yiyi, which would somewhat satisfy her own feelings, but it would also undoubtedly offend this man. If he bad-mouthed her to Manager Mi, her job would be at risk.
Moreover, by pretending not to know, this man would definitely be grateful to her, and he would naturally speak well of her later. Holding this leverage over him was a pretty good deal, with so many benefits, she should certainly make good use of it.
Li Yifei had no idea who Chen Min was, but her playing dumb pleased him. After all, exposing the truth would make both Song Xiaoli and Xiao Ning look at Su Yiyi differently, and he couldn't let Su Yiyi feel that way.