"What if people are forced to die when they get to 50?" is a very very interesting concept that can lead to amazing storytelling. The main actress (Keira Jang) and Sandra Oh are brilliant here.
But the issue is that the screenplay tries very hard to explain and even advocate for the reason for its "what if" scenario and the flaws in that idea end up being very blatant. What could have been a great story with a mysterious background ends up being a silly attempt at advocating for a flawed idea.