C321 Mental Arithmetic!

"What's he going to do?" Chiang Jiaqi was slightly surprised. What was going on with her brother? Why was he always on his mind? Could it be that the hobby that Xiao Yu mentioned was a little special?

The reason was simple. Ever since her brother met Chai Haoxuan, he felt that everything had changed and it wasn't as cold as before, but was this a good thing or a bad thing after all