given how competitive and/or lucrative the private market is, the younger teachers are changing or switching out teaching in MOE to e.g. tuition, academic-related for-profits organisations.
unless moe one day really decides to overpay the teachers to truly/sincerely attract the talents (taking reference how the member of parliaments or c-suite people are given certain pegged allowance in an organisation), then the meaningfulness/passion in teachers can also be comparable compensated. the intrinsic motivations behind teaching can be stretched and thinned out in this kind of capitalistic society.
then again, there are many young people who don't mind joining to get some little experience and then quit. so the MOE has no lack of people to fill headcount - teaching positions are really dispensable. heart-wise the organisation has a long way to work on.