So, I think this is a needed chapter of details and explanations that I'm pretty sure you'll find useful and interesting to understand more of the plot.
I'll put this random cute gif of Kookie-boo here, ft Park-Imjudgingyou-Jimin
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Cherubs I bet everyone must've been very confused all along the first chapters because of these little creatures. Well, I gave you a lot of informations about them, but there are things not Taehyung and not even the painter William know, so I'll be your teacher for the day.
First of, Cherubs are technically not real. I'll explain: they do exist for the person who hears them, but those little creatures are kind of projections of this person's thoughts, so that's why they appear when a subject starts thinking about their crush, because their thoughts are so frequent that they materialize in a physical form, which in this case are the so called Cherubs. They disappear instead when feelings are confessed, for the simple reason that, having the weight off of an enamored person's chest, they stop worrying so much about their loved one.
Which brings us to the second point: why do people like Taehyung see these things if they're not even real? Well, the so called 'humans' like Tata are basically able to see and understand a certain percentage of other people's thoughts, they can be described as mind readers on a certain level. They're very empathetic with others, they feel how people around them feel.
Someone once asked me if cherubs can see other cherubs (for instance, in the scene in chapter 13, when Giselle and Jungkook are in the same room). The reply is no, because they're not real one for the other, but only for their owners.
On what depends the number of cherubs is kind of a funny topic. A confused person who doesn't know what to do, how to act and if their crush reciprocates their love, is going to think about it over and over and over again, generating a huge number of cherubs (Jungkook is clearly in this category) while ones with their mind made up, that have crystal clear thoughts about what they're feeling can have even a single cherub (Like in Jimin's and Giselle's case)
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Legends and Deities I think I might have confused you will all the legend around the celebration of the Aèras, right? I'll remedy by putting order!
The original deities of Stoicheion were Choma, the Goddess of Earth, Aèras, Goddess of Air, and finally Aether, the two faced God of Ice and Fire. What happened is that Choma and Aèras, scared by Aether's too powerful being, decided to kill him by spitting him in two with a sword. Dividing the two beings that formed Aether, they created Pagònia, Goddess of Ice, and Fòtia God of Fire. Aether might have been formed by two deities, but splitting them, Aether's heart remained to Fotia, while Pagonia had none, and from this comes the belief of Agàpe not having hearts, and Eros being too passionate.