They are not only the strongest opponents but best friends in Go world.
I can't do all storytelling that too much. so just post news here~
Lee Sedol and Gu li attended a school go tounament between Tsinghua University(China) and Yonsei University(Korea) as team coach in Beijing yesterday!
here are some picture from Gu li's WEIBO.
http://weibo.com/u/1048563335
news and photo here
http://sports.sina.com.cn/go/2016-08-21 ... 3191.shtml
http://slide.sports.sina.com.cn/go/slid ... 8.html#p=1