Based on this article: 1.https://www.tofugu.com/japanese-grammar/particle-no-noun-modifier/ 2.https://www.tofugu.com/japanese/na-adjectives-no-adjectives/
The particle の is used as a label marker. Like for example 犬(dog)+の(particle)+おもちゃ(toys). The function of の here is to label the dog so that we know that the toys stated here is specifically referring toys for dogs. In the second article also explained that の can be used to modify a noun using another noun like for example きれい(beauty in noun form)+の(particle)+ヒント(hints) which implies that the hints are about beauty
All of the example I found is something like noun + particle の + noun. However in the first speech bubble in the pic it is 悪知恵(noun) + の(particle) + 働く(verb in plain form) and I wasn't able to find any article about this. The closest thing that I can found is when の is used in relative clause but I don't think the this is the case for the 悪知恵の働く. So I was wondering if the の can be followed by a verb like in the pic.
