C99 Go or Not!

"Ding!"

At nine in the morning, the phone rang right on schedule.

"Ugh..." Yifan groaned, still half-asleep, vaguely realizing that he hadn't set an alarm last night. So why was his phone ringing out of nowhere?

Once woken up, it was hard to fall back asleep. He rubbed his eyes and got up to check his phone.

"Remember our lunch plans. I'll pick you up."

"What plans... pick me up for what..