It was not just sunglasses.
The teapots and dishes made from transparent and colored glass were presented as tribute to King Sejong and Queen Soheon, with the queen distributing them as gifts.
Upon receiving the tribute, both King Sejong and Queen Soheon were greatly satisfied, and the glassware began to be used in large quantities within the palace.
As it was used extensively in the palace, news quickly spread to the outside world.
This meant that a significant demand had arisen.
"Immediately start mass production," ordered Hyang.
"Yes, Your Highness," came the reply.
As Hyang issued the mass production order, he couldn't help but smile slyly.
"This is what VIP marketing is all about."
The glass that began to circulate in the markets of Joseon soon garnered a huge response from Ming and Waeguk as well.
A Ming envoy, upon seeing the palace of Joseon, reported back to the emperor, leading to an order for the tribute of plate glass to be sent to the Forbidden City.
Hyang took the initiative to meet with the Ming envoy who brought the order.
"You want plate glass for the Forbidden City... for the entire palace?"
"Yes, for the entire palace."
"If you want it, we will provide it. But will the finances of Ming be able to handle it?"
"What do you mean, Your Highness?" The Ming envoy asked, puzzled.