A possible concise summary is:
Two friends are building a secret house under a mountain with a lot of riches and traps, while mocking their rival Anna who is building a poor house with old things. They also talk about Alex's mouth ulcers, Lion's candy brand, and Fabergé eggs. They make jokes, insults, and threats to each other and Anna. They end the video by asking the viewers to vote for their house.
Here are the key facts extracted from the text:
1. A nuclear fusion reaction was sustained at over 100 million°C for 30 seconds.
2. The experiment achieved a net energy gain.
3. The core temperature of the Sun is around 15 million degrees Kelvin.
4. The KSTAR facility conducted the experiment.
5. The experiment's temperature was seven times hotter than the core of the Sun.
Please note that these facts are based on the provided text and should be verified for accuracy.