Hi everyone! 

So i absoluetly love all of Kyuhyun's OSTs, and i then started wanting to listen to Seohyun's OSTs, and i noticed something about both of their OSTs, it's nothing really big or shocking but i just found it somewhat interesting.

So let's begin with their first Solo works, without the rest of Super Junior or the rest of SNSD.

Seohyun first did a duet with the trot singer Joo Hyun-Mi in Feburary 2009 called JjaRaJaJja

Kyuhyun first Solo track was part of Yoo Youngsuk's 20th Anniversary Album in July 2009 called 7 Years of love

In 2009 Kyuhyun and Seohyun (and the rest of Super Junior and SNSD) released the MV and song S.E.O.U.L (SeoKyu being the main love live in the MV)

Kyuhyun's first OST was for the drama Pasta in January 2010 called Listen To You

Seohyun's First OST was for the drama Kim Soo Ros in June 2010 called It's Ok Even If It Hurts

Kyuhyun's Second OST was for the drama Baker King Kim Tak Goo in August 2010 called Hope Is A Dream That Doesnt Sleep

Seohyun's Second OST was for the 2010 G-Seoul Summit Album in October 2010 with the recording "Let's Go"

In 2010 Seohyun and Kyuhyun did their first duet song together called Calling With All My Heart for SMTown '10 World Tour 

In 2010 - 2011 Seohyun and Kyuhyun changed their first duet song together called Way Back Into Love for SMTown '10 World Tour

In 2011 Kyuhyun released the OST for the drama Posiden (Super Junior Siwon part of the main Cast) called The Way To Break Up

in 2011 Seohyun featured in the OST (with TVXQ) for the drama Paradise Ranch called Journey

In 2012 Kyuhyun's next OST was for the drama God Of War the song being called Inoo/Rain of Blades

In 2012 Seohyun's next OST was for the Drama Fashion King (SNSD Yuri part of the main Cast)  the song being called I'll Be Waiting For You