Li Yifei soon realized that she wasn't as eager as she thought she was about traveling with Lillie. If it was before the revelation, then she would've been ecstatic.
But after everything that happened, she felt awkward and ashamed around Lillie's presence.
Even if Lillie assured that her actions were helpful—though Li Yifei thinks she's just being polite—and it resulted in a positive impact, she still can't help but feel guilty for comprising the Empire's livelihood and for causing stress.
"I can see steam seeping out of your head," Gabriel Bai sat down beside her on the plane's seat, pressing the icy can of her favorite flavored soda on her cheek. "What's causing this so much brain activity?"
Li Yifei flinched back from the cold and snatched the drink from his hand, pouting at both his action and teasing.
I believe we haven’t delved further about this situation, so here it is! Yifei accepting the mission to pretend to be White Bird wasn’t out of ill-intention, but simply because the opportunity was there and it was for the thrill—hence her name Thrill Seeker. Her original plan was to dispose An Jiaying. The incident that caused White Phoenix Empire to lose half of their property wasn’t because of her.