I don't know if there's an official name for them, but I love acronyms, so "locks of love" it is.
I discovered LOL when I was researching Namsan (literally South Mountain) and the so-called N Seoul Tower that sits atop. It's basically a few areas of fence and other structure where people connect a padlock with their message. Apparently, this happens in other places around the world, but in most cases, they get taken down. At Namsan, they actually encourage this behavior. They even have signs that tell you to not throw away your key. I thought it was some sort of joke about needing it in case you break up. In reality, it's an environmental message about the harmfulness of the metal decomposing in the mountainside.
My plan before the trip was to hike to the top of the mountain. However, since we were spending a day on the Seoul City Tour Bus and it happens to have a stop right at the top near the tower, we decided to take advantage of it. I made our LOL last-minute before we left Vegas. It's basically an old plastic folder that I cut up and I found an old padlock in a box in my spare room. Free is good. Once it came time to installing our LOL, I figured we should audition a few locations and take photos. Here are some candidates.
We finally settled on this corner spot overlooking the city below. (It's there somewhere through that haze). By the way, I wrote the Hangul on the heart. It's just a simple thing—"Jieun and Paolo and Bawoo." Yes, even Bawoo gets immortalized on Namsan.