"I'm not kidding." At that moment, Laura hugged the emerald and headed to her room, "Grandpa, trust me. I will build an even more perfect treasure and deliver it to you in four days!"

With that, Laura shut herself in her room.

Laura pressed the incandescent lamp on her desk. With the emerald in one hand and the carving knife in the other, she began to polish it bit by bit.

Luckily, she had taken her school vacation well in advance. Patience and time were the last things she needed for the next four days.

......

The head teacher took Lucy's leave slip and glanced at it. "You're taking a...