-(으)니까 gives the reason for watching or looking, and in these lines the reason is usually a personal connection or a recommendation: 내가 꼭 광수 작품이니까 보겠지만 (I'll watch it because it's Kwangsoo's), '주명이 나오니까 보러 가야 된다'. Watch out for the similar-looking 다 보니까, a different thing meaning 'as it turns out, once you've been at it a while' — 수도다 보니까 볼 것도 많고.