I tried googling ways how to remove it in Shopify but there's no answer. I also tried searching it in the codes but I can't find it. Please help!
This post was in the Script Editor app section - something your question doesn't relate to. I've moved this post to a better place.
I'd assume the script is coming from an app. I don't see it on your page now so I'd think you've found it and we can consider this all sorted.