While South Korean protesters have long employed songs, dances and chants, customized 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.

Tens of thousands of protesters have braved near sub-zero temperatures and gathered outside the National Assembly in the capital of Seoul since Yoon's failed martial law attempt last week.

"Impeach, impeach. Impeach Yoon Suk Yeol," protesters chanted to the beat of K-pop group aespa's latest techno track "Whiplash."