I thought we getting the red head story what us going on

Don't think that will happen any time soon. The author wrote the story for Josh and Chase ~two years ago and it's still not adapted into a Webtoon. And i heard after that the author wrote a story about a the Miller's parens, and plan to write the story about the oldest brother Nathaniel. And also wrote a story about Keith half brother.
So i looks like the author pushed back the story of Dane and Grayson. And the Millers have 3 more children.....