C509

A Coffee Shop

Sisi noticed Yan looking completely out of sorts and couldn't help but feel puzzled. She quickly asked, "Yan, what's wrong?"

When she first arrived, Yan seemed fine, but after taking a phone call, she appeared distracted and lost in thought. This sudden change made Sisi worry.

What could have happened to Yan? What could have caused her to be so absent-minded?

Yan