The Great Ruler of the Divine Sea

After transmigrating to a fantasy world, the protagonist happens to become the lord of a small island and turns it into a fantasy city.

To improve his life and recreate the technological lifestyle he enjoyed in his previous life, he begins developing fantasy technology.

People in this world can now enjoy unlimited, face-to-face video calls with others thousands of miles away.

Lying on a soft sofa, he holds a rune phone known as a Little Smart and watches a female mage explain the mysteries of magic.

With the birth of the fantasy world's version of the internet, people can now shop from home without ever stepping outside.