ShowDetailScreen.kt

@Composable
fun DetailArea(
    ...
    showCast: List<ShowCast>?,
    onCastItemClick: (item: ShowCast) -> Unit
) {
    val scrollState = rememberScrollState()

    Column(
        modifier = Modifier
            .fillMaxWidth()
            .verticalScroll(scrollState)
    ) {
        ...

        showCast?.let {
            if (it.isNotEmpty()) {
                ShowCastList(it) { showCastItem ->
                    onCastItemClick(showCastItem)
                }
            }
        }