This is the result of walking from morning till late at night, 12 hours or more a day for 5 days when I was in Seoul.
I believe I have pinched a nerve on my right foot. The pain started only a few days after my return from Seoul. It hurt a lot when I walk and I was limping away. Had to see a traditional tit-tar practitioner who wrapped my foot with some herbal medicine for 2 days.
Thank God I am better now.