By Hyunsu Yim SEOUL (Reuters) -When South Korea's Constitutional Court rules on President Yoon Suk Yeol's impeachment, expected in coming days, few will be watching more closely - or be watched more closely for possible rabble-rousing - than the country's activist pro-Yoon churches.

Thousands of South Koreans have filled the streets of downtown Seoul in massive rival rallies for and against impeached President Yoon Suk Yeol.

The move followed a court ruling that the detention of President Yoon Suk Yeol was invalid, but it won’t affect the insurrection and other charges he faces for declaring martial law.