Singaporean singer JJ Lin made a special appearance at Jung Yong Hwa's One Fine Day solo concert in Taiwan on June 20, showing off their close and sincere friendship. JJ Lin helped Yong Hwa celebrate his upcoming birthday by surprising him with a giant birthday cake and singing a wonderful rendition of "Happy Birthday" in Korean!

You can watch Yong Hwa make his adorable birthday wishes below!

Even better, JJ Lin also came onstage to sing their collaborative track "Checkmate" along with his own hit song "If Only."

Yong Hwa and JJ Lin collaborated on "Checkmate" last year, singing together in Korean, Chinese, and English. Check out their performance of "Checkmate" from Yong Hwa’s One Fine Day concert in Taipei here.

I had the awesome chance to attend Yong Hwa’s Taipei concert over the weekend. I can attest, the show really was filled with amazing performances, and I also loved seeing the friendship between Yong Hwa and JJ Lin! What better way for Yong Hwa to celebrate his birthday than by being surrounded by his fans and friends?

Check out more photos from the concert below and stay tuned for a full review!

Happy Birthday Yong Hwa! I hope you had a fantastic time celebrating in Taipei!

Watch Yong Hwa in the series You're Beautiful:

Rachel's K-drama and K-pop blog MY RARA POP is full of great information for any fan of Korean entertainment. Be sure to follow her on Twitter, Facebook and Instagram!