During the period when South Emperor Deun Chi Hing trained in martial arts with Central Divinity Wong Chung Yeung, the emperor was in complete isolation for many months...perhaps as long as a year. The emperor's singleminded devotion to martial arts during this time cost him his marriage to Ying Goo.
If South Emperor's long isolation had such a devastating effect on his private affairs, one can only imagine the effect it had on Dali's affairs of state. Who was running the Dali Kingdom while South Emperor was in isolation training his martial arts? Sure, he had a staff of ministers...but in an imperial system, you still need an emperor to run things.