South Korean pop star Psy has released his new song, Gentleman as a follow-up to his global hit Gangnam Style.

Psy may have sparked a global phenomenon following the release of Gangnam Style last summer, but it seems it's going to take a lot more work than anticipated to emulate its success.

The 35-year-old South Korean pop star's follow up single, Gentleman, has received mixed reviews following its online debut.

While Gangnam Style climbed to the top of the charts in more than 30 countries, broke YouTube records and spawned a viral dance, Gentleman has left fans divided.

On one hand its unveiling was met with pandemonium when it hit the web, suggesting that Psy could possibly have another smash on his hands.

On the other hand, for some fans it failed to meet the benchmark set by its predecessor.

"I think now that he tried to mix English with Korean lyrics and rhythm, The song's a bit too simple and the song lost Psy's original creativity and unorthodox style," one fan said.

Another wrote "he must be bricking it trying to follow up Gangnam style."

"At first listening seems bad as Gangham, then you start to listen it again for no apparent reason," a commentator added.

But it looks like it's going to take more than a few critics to dampen Psy's determination to succeed.

"I've been working and reworking on it continuously and I think the latest version will be the final one," Psy told a South Korean TV news programme earlier this month.

"This is another very rousing song... The dance is one known to all Koreans but new to foreigners. This will be presented in Psy style," he said.

Psy is scheduled to debut the new song live at Seoul's World Cup stadium on 13 April. The performance will be streamed around the world on Psy's YouTube channel at 6.30pm Korean time.

Watch both performances in the video and decide for yourself.