Dynamic Duo and Lena Park will gift everyone with a surprise collaboration to wrap up the 2014.

The song is titled 'SsSs' and is said to portrait various emotions everyone feel at the end of the year. It's a song that perfectly fits to listen to during the winter season as well as wrapping up this year.

Dynamic Duo and Lena Park will also perform this song at their upcoming joint concert 'This Year, Winter' from December 20th to 25th at Seoul Jamsil Indoor Stadium.

'SsSs' will be released at noon on December 5th.