C633 Difficulty

With a hong sound, Sun Yan gritted his teeth and placed both his hands on top of the door, then forcefully pushed!

But the pity was that no matter how much strength Sun Yan used, the stone door did not budge an inch, as if there was not even a sliver of force on it!

Only then did he sigh and say softly, "Sometimes, the more complicated something is, the simpler it is, but the simpler it is, the