I Have a Modern Entertainment City in Another World

The protagonist traveled to another world due to a natural disaster and came to an abandoned city. There was no orphan and he was the only one in the abandoned city. You get a system at the beginning, but there is no other system like other systems to get upgrades such as skills, pills, etc. At the beginning, some modern entertainment facilities were built, such as Internet cafes, cinemas, restaurants, hotels, supermarkets, electronics, etc., Which completely revolutionized the other world. It slowly changed from a deserted place to a sea of people, and many big bosses became his younger brothers. Cities can continue to expand and upgrade This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.