By Hyunsu Yim, Nicoco Chan, Minwoo Park SEOUL (Reuters) -While South Korean protesters have long employed songs, dances and chants, customised light sticks popular with K-pop fans have emerged as an effective new tool for demonstrators calling for the impeachment of President Yoon Suk Yeol.

South Korean President Yoon Suk Yeol will fight a possible impeachment rather than step down early, a local media report says, a stance that would likely lengthen the duration of the political chaos sparked by his martial law declaration.

Opposition lawmakers vowed to keep trying to oust Yoon Suk Yeol for declaring martial law.