More than 20,000 devoted fans of Korean pop and film stars packed the Osaka Dome on Tuesday night to see the charity concert "Hallyu Festival in Osaka" hosted by the Seoul-based International Vaccine Institute to help children suffering from infectious diseases.

The concert turned out to be a huge success thanks to the all-star lineup of Hallyu stars. Jun Jin, a member of the popular six-man group Shinhwa, broke the ice with songs from his first solo album released in November, including "Love Never Comes Easy (Sarangi Ojianayo)." Almost every time the Shinhwa man said something on the stage, he ended it by whispering "aishiteru ("I love you" in Japanese)."

After Jun's performance, Kangta, a former member of the now-defunct boy band, H.O.T., was onstage to present his trademark voice through a rendition of Richard Marx's "Now and Forever" as well as his past hits. He was followed by the showcase of Meilin, a young Korean female singer who dreams of being the "next BoA" in Japan, with her debut album, "Save My Soul" scheduled to come out next month.

Top R&B Trio SG Wanna Be stole the show with their loud-yet-sensitive vocal delivery, while Lee Min-woo (also known as M), another Shinhwa member, showed off his energetic dance moves and charismatic stage presence. The biggest star of the concert, however, was not a singer. By simply waving his hand and smiling, actor Song Seung-hun made his Japanese fans go wild.