"Checkmate" is a song by South Korean musician Jung Yong-hwa of CNBLUE and Singaporean singer JJ Lin.

JJ Lin attended CNBLUE's Blue Moon World Tour (2013) concert in Taiwan, where he first met Jung.

[1] Following their initial meeting, Jung began listening to JJ Lin's music and "felt good" about it and sought to collaborate with him.

[2] Wanting to work with a foreign musician, Jung decided on JJ Lin to be the first collaboration for his debut solo album One Fine Day.

Filming lasted 27 hours, and it includes a scene of the two standing atop a 25-story building wearing "thin" suit jackets in temperatures as low as −8 °C (18 °F).

[14] The duo portray lethargic salarymen; Jung's character is a recent hire "who questioned the simple works such as telephone answering and copying documents", in contrast to JJ Lin's "veteran employee who forgot the feeling when he had been a novice".

[18] The song was used in the set list of the 2015 Jung Yong-hwa Live "One Fine Day" concert series, his first solo tour.