Why did Nezha change people?

Nezha, the prequel to Lotus Lantern, was replaced because of the star schedule. The three Madonna in Lotus Lantern are Park Mei-hyun, Zhou Yang in Lotus Lantern, and then Lin Xiangping in Lotus Lantern is lilac, and then there is no comfort. Nezha is played by Zhang in Lotus Lantern, and the actor schedule is not suitable. The Lotus Lantern Prequel is a 46-episode large-scale new drama created by the original team, which continues the creative style and story context of the last Lotus Lantern.