Success is an episode from season six.
In the episode, Embless and Rief sell their book series, which makes them filthy rich. They begin to expand the house, but they completely forget about Tyrell and Karis, who are forced to live in the poor old house with no money. Embless and Rief eventually get so much money that they attempt to overrule the the Cartoon House with the size of their house. Of course, at this challenge, Kali and Julian crush the house, leaving them to live with Karis and Tyrell.
"Embless and Rief get super rich, but they forget Karis and Tyrell."