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So here is the full idea:
Mark and Donghyuck are kids of Greek Gods, which makes them halfgods, but also halfhumans. They inherited some aspects of their god parent's abilities, so Donghyuck as Apollon's child is blessed with a angelic singing voice, but also a witty tounge and cleverness, which he uses often to annoy the fuck out of everyone around. He also is like the embodyment of the sun always so happy and cheerful, that he brightens up other people's days. He can also weild the bow like a master, but if he actually shot an love arrow at Mark's heart is up to imagination.
But Mark definitely feels like it, because his heart always does sommersaults, when Donghyuck just so much as glances at him. He loves every single of Donghyuck's little quirks and secretly enjoys when the younger hugs him or even teases him about some stupid thing. Mark also is a god's son, but I couldn't yet decide which.
Added Bonus: If it is actually placed in the times of the ancient greek and you include a little of how it was living back then or maybe some myth they ecounter from back then.