on patch note .april 12, 2017 the maste level exp requirement should has been changed ,,but it not change ,the master level exp requirement still the same.
exp table on patch note april 12, 2017
and today i was try to leveling from master level lv1 to masterr leve lv2 it still need 1000 MP ,Not 500 MP like a new MP requirements
PLEASE FIX IT ,and sorry for my bad english