I have a Korean neighbour in Edinburgh. When my parents were here few years ago they noticed that the Korean Children call their parents as 'Amma' (mother) & Appa (father). I was surprised by this news and spoke the Korean Children & Parents about equivalent words they use for common Tamil words. It was surprising to see the similarities. How did this happen? The countries are far apart. Koreans and Tamilans don't even look similar in appearance. That triggered the idea that i need to do some research further on the relationship between Tamil and Korean language.
(work in progress. I have been planning to research and write this article for several years. One day i will get back to this topic again :-) )
References:
1. Interview with Jung Nam Kim President, Korean Society of Tamil Studies
https://www.youtube.com/watch?v=eGSrEAW0c_A
2. Ankorwat built by Surya Varman
https://www.youtube.com/watch?v=A8d_MsLNz4M
3. Rajendra Cholan Kingdom Map
https://upload.wikimedia.org/wikipedia/commons/archive/c/cf/20110528043623%21Rajendra_map_new.svg