The Supreme Art Of War Is To Never Fight A Battle

Yuanen Zhentian calculated that he could extend his longevity by thirty years at least if he remained cultivating at Shrek Academy.

What could be more attractive to him than that? Furthermore, the Ancient Life Tree had also transmitted its consciousness to him. It informed him that every person from his clan that had cultivated to Limit Douluo-rank would qualify to cultivate by its side. 

Why did Long Yeyue have the courage to reveal her youthful appearance to the public? It was because her issue with life energy had already been solved. She did not need to worry about her life energy depleting in a short while. The resurrection of the Ancient Life Tree was the true core of Shrek's reconstruction!

Thus, Yuanen Zhentian and the entire Titan Giant Ape Clan were fully committed to Shrek Academy.