really good point tbh
It's a throwaway line at the beginning (something about liking the way Jisuh looks at things), but I'd taken it that the actor was in love with Jisuh's camera work. Sort of how you can look at a painting and feel the artists intentions and fall a bit in love with your idea of them. And then actor guy transferred those feelings on to the actual cinematographer. Compared to some yaoi protagonists, I think Jisuh's got solid character definition. Not amazing, but better than average, I'd say.
You must not like tofu
Sure Jisuh is dull in terms of appearance, but he's not portrayed as ugly. In fact, his striking points are his pushover personality (which "attracts" predators like Heejae) and his sensitivity/expressions (which makes him erotic for certain people).

Something about this manhwa is irritating...I just can’t put my finger on it...AHH!! I just realized it! It’s like the ‘Twilight syndrome’. Jisuh is really boring, so why do these two interesting people like him so much?
It’s like in Twilight! Bella was incredibly dull, had NO hobbies, or even a personality, so why did two interesting guys like her soooooo much?