Song Joong Ki will be making a cameo appearance in Lee Kwang Soo's upcoming web drama 'The Sound of Your Heart'.

According to Blossom Entertainment, Song Joong Ki is currently filming his appearance for KBS2 TV's 'The Sound of Your Heart'.

As Lee Kwang Soo previously appearaed in 'Descendants of the Sun, this time it's Song Joong Ki's turn to show his loyalty towards his best friend.

'The Sound of Your Heart' will be broadcast via Naver TV Cast in the second half of this year.