On the other side, Wang Lun and his partner finished work a little late today, so they made dinner even later. It was already dark when they finally walked back to the camp from the construction site outside. It wasn't actually far, only about ten steps, but there was no bramble fence outside, while the camp had one, making it feel much safer. Today, Wang Lun had dug the foundation for a section of the mud house to the marked line and then dug a little further ahead, though not to the bottom yet. However, this amount of soil was enough to build one wall half a meter high, level with the formwork. The other wall was also halfway built, with only the horizontal branches just secured. It was because it wasn't fully secured that they had to work overtime. Wang Lun had also considered safety; with the half-meter-high formwork in front and the camp just a dozen steps behind, there was a sense of security, which was why they decided to work overtime.

Back at camp, the two rested for a while before Li Ling got up to get ingredients to cook, while Wang Lun went to fetch a pot of water. Cooking together seemed faster, and soon a pot of wild vegetable stew with fish was ready. That evening, they each had a fish, plus some wild vegetables, stewed together in one pot. It tasted quite good, but they were getting a little tired of fish after eating so much, and with no other food, fish was their main staple. Of course, the other contestants were unaware of their situation. If they had, they would have been filled with envy and jealousy, since they were mainly eating wild vegetables, and some contestants even relied entirely on luck, eating whatever they came across.

The two finished their meal quickly, and after a quick wash, they prepared for bed. Of course, the bed wasn't extended; it was unclear whether they'd forgotten about it while busy building their campsite, or for some other reason.

Back on the hillside, at the campsite of the Liu sisters, Liu Ruoxi and Liu Ruoxi, the two sisters finished their dinner and quickly washed the pots—basically just wiping them with weeds. Then they continued building the last wall. Working together, they quickly completed it. On this wall, they also made a door and a window, both of which could be locked from inside the treehouse. They left a walkway of about half a meter outside the wall for drying food later; for now, they only had wild vegetables and birds, and even the birds had to be dried a bit before being brought up to the treehouse. Then they spent some time moving all their tools, including sleeping bags, to the treehouse. As for the shelter on the ground, they planned to use it as a storage room; if there was nothing else, they would use it to store firewood. The campfire was moved under the treehouse so it wouldn't get extinguished in the rain. The dried wild vegetables were bundled up and placed inside the treehouse, while those still damp were hung on the eaves to continue drying. As for the smoked meat, it was hung under the treehouse, where a campfire continuously smoked the meat to make it as dry as possible, which would make it easier to store.

After finishing their tasks, it was around 9 PM, so the two prepared to sleep. Since they were now in the treehouse, and the doors and windows were locked, plus all their tools, a long spear each, and several short spears were inside, they decided not to keep watch and would sleep together. Because the sleeping bags were single-person bags, only one person could sleep in each. They divided the sleeping space, one sleeping for the first half of the night and the other for the second half. Previously, there had been a watchman, with one person taking the first half and the other the second half. Now, without a watchman, each person had to sleep one night. Liu Ruoxi had initially suggested that Liu Ruoling sleep there, but Liu Ruoling felt that Liu Ruoxi's physical condition wasn't as good as hers, so she let Liu Ruoxi sleep there. Since they both offered each other sleeping space, Liu Ruoxi decided to just sleep one night each. So, one slept in the sleeping bag, and the other slept in the haystack. It was better than before; at least they could both sleep.

Just as Liu Ruoling lay down, she looked up at the sky and saw the stars through the treetops. She said to Liu Ruoxi, "Sister, why don't we skip building a roof? We can still see the stars then!" Liu Ruoxi replied, "Yes, and if it rains, we can take a shower while we're at it. We might even see bird droppings on us in the morning." Liu Ruoling paused, then her mind raced, and she said, "If we build a roof, we won't be able to see inside." Liu Ruoxi thought about it and agreed, but she didn't want to leave the roof behind. Even with a roof, they couldn't see at night. Opening the windows would provide some light, but there would still be many areas they couldn't see. So she asked, "Do you have any good ideas?" Liu Ruoling said, "Why don't we just light a fire in the treehouse?" Liu Ruoxi said, "That's a good idea! If we're lucky, we'll only burn the treehouse; if we're unlucky, we'll burn the treehouse too." Liu Ruoling said, "Sister, you forgot? We had some charcoal stored before. We can use that on top of the treehouse." Liu Ruoxi thought for a moment and said, "That's a good idea. We can also separate it with stones, and it would be best to have some kind of container." Liu Ruoling said, "Sister, how about we make a flowerpot, fill it with soil, and then light some charcoal on top?" Liu Ruoxi said, "Okay, then you can make one tomorrow. It's getting late, go to sleep." After saying that, Liu Ruoxi ignored Liu Ruoling and went to sleep. Liu Ruoling looked at the stars for a while and then fell asleep as well.

Meanwhile, Wu Jing and Zhang Shengnan were not at the campsite, but rather on the grassland. It turned out that in the afternoon, while searching for prey, they spotted a lone antelope. In their pursuit, they chased it quite a distance, and since it was already late when they found it, darkness fell before they caught up. Fortunately, they found a tree and decided to spend the night there, returning to camp the next morning. As for the antelope, that was out of the question. They lit a campfire under the tree, wove some rope from the grass, and gathered plenty of firewood and stones. The firewood would keep the fire burning all night, and the stones could be thrown in case of wild animals. They took out some dried meat they had brought with them, each eating a little, and began to endure the long night. As usual, Zhang Shengnan slept for the first half of the night, and Wu Jing slept for the second half. This time, however, Wu Jing did not choose to keep watch on the ground. Instead, she sat on a branch above the campfire, where she could look out into the distance and keep an eye on the campfire and Zhang Shengnan sleeping next to her. After all, they were on a deserted island, and the night was still very dangerous.

Fortunately, nothing happened that night. The next day, Wu Jing and Zhang Shengnan got up just as dawn was breaking, preparing to return to camp. After spending some time putting out the campfire, the two began their journey back to camp.