
Spoiler
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They'll get separated later and even when they still share a body they can communicate just fine like they did now in the manhwa, in the novel hoyeol telling grandfell to be a good boy or sometimes calling him "my grandfell" and then there's granfell rampaging when hoyeol went unconscious for a bit he said "you've stolen a ray of light from me" blah blah and even called him "my dear", and then in the future hoyeol also brought granfell to meet his family and even chained him, there's also their confession lines, the way both of them thought of hiel as their child...
There's so many moments about them so if you want detailed plot and fruity bromance I recommend you read the novel too
I heard this was gay as fuck someone confirm this