Reading signs in korean on the Subway to my mom

It's a bit of an odd story but my mom was pointing out a digital sign on the subway in the US and asked me if it was written in Korean. Spoiler alert: it wasn't. I started to explain the differences between Korean and the language she was looking at, Thai.
She was having a hard time visualizing it so I got out a napkin and a pen from my bag (I didn't have any paper) and I wrote my name and her name in Hangul. I explained how the sounds were made, each letter corresponds to a phoneme.
Then we did see a sign in Korean and I sounded it out for her and told her what sound each character made. I could only recognize a few of the words but just being able to read Hangul made it a really rewarding experience. Now my mom is telling all her friends about it and they want me to write their names in Hangul as well! haha