"Miss, please come over and take a look at this. I-It's..." Jin Ling frowned as she pointed at a dark corner of the palace wall.

It was a small but fixed hole in the wall that looked a bit like a dog door. It was fixed by piling up a few bricks negligently. The bricks were covered with moss, and they blended with the hue of the surrounding palace walls. Apparently, the walls had weathered through the years.

However, it was unexpected to see such an untimely ...