C3993 Solve by Yourself

Zhang Xingyun casually said a few words, then looked at the two of them and asked, "Both of you are waiting for me here. Is there something you need me for?"

Tian Tian hesitated for a moment. He looked inside and asked, "Is there anyone else?"

"No, we're the last ones out." Upon hearing Tian Tian's question, Zhang Xingyun immediately thought that it might be something urgent and asked