Since I'm not familiar with the specific 'one room light novel', the main characters could be various. It might be a reclusive writer who has his entire world within that one room, and his interactions with the delivery person who brings his supplies could be part of the story. Or it could be a sick person who is bedridden in that room, and the nurses or family members who visit are also important characters in the narrative.
Chapter 648, "Even Wild Boars Make Way!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Li also casually picked up a tree branch and then directly...
Chapter 684, "It doesn't matter if it gets broken, I have the money to fix it.", is the clearest early answer because it turns Wu Jin's situation into a concrete plot event. It opens with But Jiang Li had already evolved; she was now a film producer who...
The best chapter pointer here is Chapter 9, "The Qiao Family's business isn't big, but they have quite the audacity". It opens with Exactly, the Qiao Family isn't that great either. and closes on Qiao, unable to save face, slapped her daughter across the face, "Didn't I....
Chapter 552, "Branches, 20 Points Each, No More", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event.
Chapter 489, "Has She Been Morally Kidnapped?", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Yeah," Nina nodded, "I thought you looked pretty imposing, must be...
Chapter 552, "Branches, 20 Points Each, No More", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event.
Chapter 672, "Wealth Brings Wealth, the Early Bird Catches the Worm!", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The president immediately stood upright, "We are all officially...
Chapter 705, "Is She Her Own Destined Noble Person?!", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. The chapter gives readers a real answer by opening on He Wen was made to laugh by Bai Lu.
Chapter 879, "Is it My Turn to Settle Accounts?", is the clearest early answer because it turns Blood Buddha Beads's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Li gave her a meaningful look.
Chapter 798, "How to Be a Dad? You Don't Even Care About Your Child!", is the clearest early answer because it turns Jiang Buchen's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jiang Bufan sniffed hard and took a step back.