I honestly love MC and Sooyeong's sibling relationship - a lot of works would shoehorn in a harem for whatever reason, but so far there's only been one potential love interest (besides the fact that Sooyeong is much older than MC lol)
I understand the director/chief guy's doubts, to him, this child actor who made it big years ago might be coasting on his one minute fame and gimmicky cameos. Glad to see Youngguk prove him wrong.