Hi,
There needs to be a system in place whilst there is a clock counter ticking when dramas are still mid-airing, no reviewers can be allowed to press the "completed" button during this time. This is misleading to others when the reviewer cannot possibly be honest when the drama has only aired 50% of the way, and they press completed.
I have also been informed that using the app, users said they are unable to show how many parts they have seen and it directs them into "completed" which is an issue. Either don't allow anyone to write a review at all until the drama has completed, otherwise it is open to abuse and giving false impression of reviews in general.