I think it's because of the haters. There's been an issue between Jung and Book this past week, And they've given hates to both . To the point that Jung's mom came and posted a story and was very upset about this situation. The series' ratings have dropped because of this. But it doesn't matter. What matters is that it's become more famous.
@bidulgi's comment which is below explained
I wanted to see it😭😭