Why did the third part of Princess Zhu Huan change actors?

Let Angel play Wei Zi, Ma Yili will never be worse than Ruby Lin, but her face value is too ordinary. The swallows in the crystal are wonderful. Seriously, the role is not suitable for him or Zhao Wei is better. Qin Lan is a good actor. In the third part, he is the biggest attraction. As long as Zhao Wei doesn't change Ku Wei Xiao, Alec Su is still good. He is too short and deeply attached to Zhao Wei and Gigi. Angel's beauty and acting skills are outstanding. In my opinion, he plays Wei Zi better than Ruby Lin. It would have been better if Erkang had been replaced by Huang Haibing, but Zhou Jie was not bad. My ideal actors are Zhao Wei Swallow Angel Xia Ziwei Kuquiqi, May Fu Jie, Huang Xiaoming, Er and Mu Sha of Tamia Liu, as well as the outstanding watery painting Qin Lan. If these actors can return to Pearl III, they will definitely hit new heights. Of course, Zhang Tie-Lin's success is irreplaceable by Tommy Tam's acting skills. It's a pity that I'm too old to be motivated. Zhang Tie-Lin looks very comfortable. Qiong Yao's casting may also be a pity, and the beauty of angels between heaven and man should play an irrelevant role. What a waste. He is more suitable for Xia Ziwei than Ruby Lin. Angel is really drowning in fish. No wonder Qiong Yao likes her so much, but unfortunately, the actor without a timetable was in a hurry and didn't return the pearl. The biggest failure is that the swallow is too far away from Zhao Wei. One is strange pharynx, the other is bitter pharynx, and the other is fatal pharynx. If I were Mei, I would definitely choose Qin Lan, because she is beautiful, gentle, generous and decent. Even if she has all her plans, it won't make people hate that the crystal is even worse under Qin Lan's name. The swallow is a soul, and it can't change what Zhao Wei didn't think before. Now, it's good to return the pearl to the princess. If you follow my cast list, you will continue the same glory of the first and second films! ! !