Cannot Cancel DramaBox Subscription Through Google Play

I have a weekly Drama Box subscription that I purchased through Google Play, and I want to cancel it but cannot find any cancel button or option within the app. When I go to the account or deletion screens, I only see a warning that my subscription is still active, but I am not given any clear way to stop it. Because of this, I am worried that the subscription will keep renewing and charging me even though I no longer wish to use the service. I am asking for my Drama Box weekly subscription, which is billed via Google Play, to be cancelled on my behalf as soon as possible and for all future charges to be stopped.