Mo Jiuli, after subduing the people of Cloud Peak, originally planned to attend the Academy Competition with Di Minghan. However, her intention to leave the Academy changed. Mo Jiuli decided to let Elder Dan and Dean Lin stay at the Academy for a few years and then take them to Cloud Peak. This would save them from much trouble, and at least by leaving together, they could directly reach Yuhai Academy at Cloud Peak, meaning they wouldn't have to go to Yuhai Academy themselves anymore...
As for why Mo Jiuli and Di Minghan decided to head to Yuhai Academy at Cloud Peak, it's because they already knew that to leave Cloud Peak and proceed to Jiuzhou Heavenly World, they must ascend once again, undergo Thunder Tribulation, to get to Jiuzhou Heavenly World; otherwise, they wouldn't be able to go at all...
