Well, 'Star Wars' has multiple planets with different species and cultures, much like what might be in 't's planet science fiction'. Also, 'The Expanse' series often explores different planets and their characteristics in a science - fiction context. In 'Star Wars', planets like Tatooine and Hoth are iconic, each with their own climates, species, and cultures. The same kind of exploration of planet - specific features could be found in works similar to 't's planet science fiction'.
There are many other science - fiction works that might be similar. For instance, 'Foundation' by Isaac Asimov. While not as planet - centric as some, it does involve different worlds within a galactic empire. Then there's 'Ender's Game' where the Battle School is in orbit around a planet. The world - building in these works, in terms of creating unique planetary settings and the associated cultures and technologies, is somewhat similar to what we might expect in 't's planet science fiction'.
Chapter 666, "It Really is His Mom!", is the clearest early answer because it turns Xi Yang's situation into a concrete plot event. The chapter turns that into something concrete by moving from The crowd was shocked as they turned their attention to the unknown,...
A practical answer is Chapter 291, because it turns the idea into a concrete scene. The chapter opens with Tell me more about the strength of that sect of yours, what makes you..., adds pressure through The Disgust in the giants' hearts towards the intelligent creatures..., and ends on he really.
Chapter 660, "Includes Meals and Accommodation?", is the clearest early answer because it turns Accommodation's situation into a concrete plot event.
Chapter 899, "It's actually a seal script?!", is the clearest early answer because it turns Rong Kexi's situation into a concrete plot event. Early on, Jiang Cheng, with his head dizzy, was pulled into the courtyard by....
Chapter 838, "Just Call Me Grandpa", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. The chapter turns that into something concrete by moving from Gu Qiang's expression was subtle as well.
Chapter 802, "Gone Again!", is the clearest early answer because it turns Wanzhi's situation into a concrete plot event. The setup is Have you checked the fifth floor?, but the pressure keeps building through What about the kitchen?" "You can't even watch over two kids, what's....
Chapter 572, "Only Second in the Country", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Little brother, this is a competition, and I won't go easy on you...
A practical answer is Chapter 2, because it turns the idea into a concrete scene. The chapter opens with On the top floor of the Financial Building, a gathering of dark clouds..., adds pressure through In my opinion, Mother should kick out this troublemaker who's a stranger., and ends on Jiang.
Chapter 609, "What identity would make the Crown Prince barbecue!", is the clearest early answer because the hidden truth stops feeling like mere subtext. A useful checkpoint is the way the scene starts with Jiang Yan: "!!!" Right, the Cat and Mouse Game was over, they had...
Chapter 572, "Only Second in the Country", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Little brother, this is a competition, and I won't go easy on you...