
You know I really don't think Callisto is as bad as he is made out to be- he rose to become one of the main candidates for becoming an emperor without much support unlike the other prince and the rumours about him seem to be like those spread about our FL- to keep people wary & away from them, to thrust them into isolation & despair. What's different for them is that Callisto embraced & became an embodiment of those rumours and the way he acts became a facade.
I haven't read the novel but this is just what I think & why I think he is actually a good guy underneath all these looks of I don't give a fuck about anything.

Euijoon I can fucking kiss the shit out of you for just the way you think but Ah juicy will murder me XD
So thank you, thank you that even though you were scared you still wished to sort it out with Ah juicy or just talk to him and not break the relationship you've built because you care for him- this is the most mature kind of stuff that people should do and I'm so glad they are doing it

I know some people might be annoyed by the way Yechan is acting but we should remember- he doesn't have many people to hang out around his age, he is experiencing his first love & he in general has a very forthcoming and bubbly personality.
These 3 factors play a very big role in the manner he presents himself and personally I love it; it's truly so heartwarming to see a character who is so innocent and warm with his love; he makes me want to be more outright about my own emotions.
Yechan is amazing and I swear to god I'll cry of he gets even a little hurt in the future.
OMFG the heart & kiss artwork had me drooling- who would've thought that the author recognised the need of the readers to ship two good looking eligible bachelors embroiled in a mortal enemies situation together under the trope of enemies to lovers XD