Justin Bieber had a special surprise guest for his South Korean fans.

Nearly an hour into his set at Seoul's Olympic Stadium, the 19-year-old superstar announced to the crowd of over 14,000 fans that he had a surprise guest--Big Bang rapper G-Dragon.

G-Dragon performed his solo hit "Crayon," after which told the crowd to enjoy the rest of the show.

"As Bieber will show you a better performance, I hope you will have fun until the end," G-Dragon said, before walking offstage.

Bieber than launched in his song "Out of Town Girl."

After the show, the teen idol thanked G-Dragon for stepping onto the stage with him in a message on Twitter.

"Korea that was amazing. Thank you for the love. Shout out to my friend G-Dragon for coming out on stage tonight," Bieber wrote. "They went crazy. [I'm] honored."

Although he was reportedly backstage with his manager, K-pop icon Psy did not perform at the concert.

Yet Psy, G-Dragon and Bieber and have inarguably become the K-pop celebrity wolf pack of the moment since the teen star touched down in the country earlier this week.

According to the Inquistr, G-Dragon first met up with his two pop star friends and their manager Scooter Braun on Tuesday, when the group of them headed to a recording studio for a Bieber session.

Psy gushed on his Twitter account about observing the Biebs in action.

"I just saw a guy who wrote melody and lyrics and [then] finished recording them in less than an hour," Psy wrote.  "Justin Bieber [you're] insane!"

On Wednesday afternoon Bieber even visited the YG Entertainment cafeteria, dining on marinated fish and various other side dishes before heading upstairs for a meeting with G-Dragon and the record label's resident producer Teddy.

The YG Entertainment roster includes Psy and Big Bang.

Bieber is currently on the Asian leg of his Believe Tour.

Started in September of 2012, once it concludes in December, the American star will performed 150 shows on all five continents.

Meanwhile, on Tuesday it was reported in the Japanese media that footage from G-Dragon's recent eight-country tour is to be released as a 3-D film.

G-Dragon will be appearing at Singapore's Marina Bay Sands resort as part of the country's fashion week on Saturday.

Admission for the performance, which is being billed as a "private showcase" are $96 for standard tickets and $800 for a meet and greet with G-Dragon, according to the Singaporean publication Today Online.