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.
The story becomes more beautiful as it goes on.
@bidulgi's comment which is below explained
I wanted to see it😭😭