If you're looking to use a service like Keycodevip for Dramabox, here are some general steps you might follow:
Oddly enough, game modding forums are excellent for this. Since Dramabox uses a similar coin system to mobile games, dataminers often post leaked VIP codes there.
Official gift codes (often what users refer to as "keycodes") are released by DramaBox to reward loyal viewers. These codes can unlock free episodes or small amounts of currency. DramaBox - Stream Drama Shorts - Apps on Google Play