Singer Park Hyo Shin's concert 'Happy Together' with 20,000 seats sold out completely.

Park Hyo Shin's 15th year anniversary tour, 'Happy Together' tickets went on sale on October 15 through Interpark and they sold out within 10 minutes of release.

As soon as the tickets became available, more than 200,000 people were on the site trying to buy the tickets, causing the server to crash and hundreds of fans calling the site to complain about not being able to buy tickets.

On the day of the sales, Park Hyo Shin's name as well as his concert was on the top of the search engines all day, making it a 'Park Hyo Shin Day.'

'Happy Together' will be a concert featuring Park Hyo Shin's hit songs and other tracks for his fans.

It will take place in the Olympic Garden Park on December 13 and 14.