"I'm going to build an underground city." My words shocked the old man for a long time. "Underground cities? Underground cities?" The old man muttered. "Yes, the underground city, but we have two difficulties. I hope that the game company can help us solve them." I said. "What difficulty?" The old man was still a little confused. "First, lighting problem. As you know, the difference between the underground city and the underground city is mainly in lighting. I hope the game company can give me a sun or a blue sky," I said seriously. "Haha, good, young man, you're talking big. But, how can you think like this? You have to know that we can't break the rules of the game." The old man had regained his shrewdness at this time and said cunningly. "Haha, this is not the question I want to k

