Actor Lee Kwang Soo recently congratulated fellow SBS' 'Running Man' co-star Kim Jong Kook on his 17th year anniversary since his debut.

On September 1st, Lee Kwang Soo took to his Twitter to congratulate his senior tweeting, "To Jong Kook hyung whom I love, congratulations on your 17th year anniversary since your debut", along with a photo of the two together.

The photo shows what looks to be a behind the scenes capture of Kim Jong Kook and Lee Kwang Soo appearing on 'Running Man'. The two are seen smiling and seem to be having a good time with each other on set.

Upon seeing their friendship, fans commented, "Although the two seem to bicker on TV, I guess they're really close in real life", "Congratulations on your 17th anniversary!", and "Kim Jong Kook must feel good to have a dongseng like [Lee Kwang Soo]."

Singer Kim Jong Kook made his debut in 1995 as the vocalist for former idol group Turbo.

Congratulations Kim Jong Kook!

Source + image: Lee Kwang Soo's Twitter