Alright let me explain the wild connection here while you try to decode the cipher.
It was going to be Din for dramatic irony, but it really did not fit, so I added a twist.
The screenplay took inspiration from Star Wars, so I thought it would connect back. The character Harold/Old Man reminds me of Obi Wan. Obi Wan is one of my favorite Star Wars characters, as I already mentioned. Obi Wan is used in memes, which I like to post. The character Harold can be connected to Hide the Pain Harold as well, which is another meme.