Song Joong Ki is returning a favor to Lee Kwang Soo!

Earlier this year, Lee Kwang Soo made a cameo appearance in the very first episode of Descendants of the Sun. You remember his part-time gig, right? If not, below is a behind-the-scenes clip from King Kong Entertainment's official YouTube channel to refresh your memory.

Song Joong Ki is doing the same for his close Running Man friend in Lee Kwang Soo's upcoming web series The Sound of Your Heart. A source from Song's agency Blossom Entertainment reportedly told Daily Sports the good news today. “Song Joong Ki is participating today in the shooting for KBS 2TV web drama The Sound of Your Heart,” they stated. The upcoming web drama is based on author Jo Seok's successful webtoon of the same name, and it's the longest running South Korean webcomic. Actress Jung So Min will help Lee Kwang Soo bring the popular series to life.   

Song Joong Ki and the Puck actor have been friends for seven years after meeting on the set of Running Man. Fans are probably very excited to see these two united on-screen once again. Hopefully they will co-star in a future K-drama together so we can see their bromance every week!

What type of TV series would you like to see them together in in the future? 

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Source: Via