Despite this KGB spy camera being a relic of a dark and disturbing period in history, it's hard not to admire the ingenuity ...

Emma Fierberg: I'm looking for the camera. Is it on the doorknob? Michelle Yan: It's not on the doorknob. Michelle Yan: So, we got our hands on some spy gear from Amazon. (These are so tiny).

I can remember the first time I heard about South Korea's spy cameras. Just after arriving in Seoul, I was running to the public loo along the river Han while on a bike ride with a friend.

Narrator: Before "I Spy," Walter was a commercial photographer ... Originally, Walter used a large-format camera to photograph each scene. This created huge 8-by-10 negatives.

More than 30,000 cases of filming with the use of hidden cameras were reported to police between 2013 and 2018 Kyung-mi (not her real name) was mocked online, sneered at by social media bullies ...