Song Joong Ki is making a special appearance on upcoming web drama 'Sound of Heart' for his best bud Lee Kwang Soo!

On May 16, Blossom Entertainment stated, "Song Joong Ki is participating in today's shoot for KBS2's web drama 'Sound of Heart'." 

SEE ALSO: Lee Kwang Soo returns to SBS entertainment program for the first time in two years

Previously, Lee Kwang Soo appeared on the first episode of 'Descendants of the Sun' in support of his friend. This time, Song Joong Ki is visiting the set of 'Sound of Heart' to return the love he received from his bromance partner!

The web drama is set to air in the fall. Keep in mind that you'll not only get to watch Lee Kwang Soo and Jung So Min's romance, but also Song Joong Ki's cameo appearance in 'Sound of Heart'!