It is a little while since I visited but the very long establisehd Arirang in Poland Street opens Sunday and was always a good bet for a meal. There is not much here but I shall give you the website anyway.
I have always had great meals there.
Hope this assists,
You will find in China Town which is just across the road (Shaftsbury Avenue) from Soho, all restaurants including the all excellent Korean restaurants will be open as usual for business on Sundays.
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