Zhu, wearing Google Glass, said he encountered curiosity from officials and was inspected before he was allowed to take pictures with his wearable camera/computer device.
"At the first sight they were able to tell it is a photography device. But without Internet -- no Internet service available for temporary foreign visitors in North Korea, the glasses are just a wearable video camera," says Zhu.
"They were suspicious of the Google Glass at first though, asking me some questions about it -- how it work, what does it do, etc.. I let them played around with it and they seemed flattered and inquired no more," says Zhu.
A DPRK official actually accidentally recorded himself while toying with the Glass but Zhu didn't upload the photos in case there might be consequences, for them or himself.
Here are the things that stood out to him the most during the trip, in his words:
1. North Korea was using Samsung (a South Korean multinational electronics company) Air Conditioner at the DMZ (Korean Demilitarized Zone). But 99% of the air conditioners and fridges I saw are Chinese-branded.
2. The highway was extremely bumpy and I saw a decent amount of North Koreans digging -- apparently -- wild vegetables for food on both sides of the highway.
3. I met more foreigners than I expected in North Korea. Actually there were quite a few foreign (non-Asian) tour groups. I also met some Egyptians walking freely in Pyongyang.
4. A tour guide asked me sincerely, "Is South Korea better than North or not?" but he refused to look at the photos I took while I was in South Korea.
"Is South Korea better than the North or not?" asked one local guide.
5. Here are some recaps of the conversation between me and the tour guide: The guide couldn't believe Seoul has more than 12 subway lines, has never heard of Kim Jong-un's "study abroad in Switzerland" experience and was surprised when hearing that the daughter of Xi Jinping was studying in the States.
He knew way too [little] about Kim's wife, had heard about China's corruption but not the Sewol ferry accident. He visited China once and found out China had serious pollution issues.
6. Apple or Sony? Another guide asked us.
7. The visitors/tourists from the Chinese government dropped significantly after the Chinese government called for its officials to curb public consumption and avoid extravagance, according to the tour guide.
8. There was no button for 5/F at the Yanggakdo Hotel.
9. Automobiles I saw in North Korea are mostly Chinese (approximately 60%) -- Chery, JAC Motors, Dongfeng and King Long. About 20% are Japanese cars like Nissan and Toyota, 5% DPRK brand Pyeonghwa, 5% South Korea's Hyundai and 10% other cars like Benz etc..
10. It only costs Chinese about RMB3,000 ($500) to visit North Korea but the very same trip might cost a U.S. passport holder about $3,000.