C166 The Idea of an Equation

When he was in the car, Faang Cheng took the time to call Chao Xi. The two of them had not contacted each other for a few days, even if they contacted each other, it would only be in the morning, at night, it would be good night.

When the call connected, he could hear that the Chao Xi on the other side of the phone was very busy.

"Day and night!"

Faang Cheng gently called out her name