The boys - nay, men - of idol group Shinhwa celebrated a mind-boggling milestone in their musical careers with the 15th birthday of the formation of their group.

In a post to their official Twitter, the members of one of Korea's most iconic boy bands gathered together for a celebratory group shot, cheering energetically with a birthday cake.

As one of the longest-running idols around, Shinhwa serves as a role model for many of today's rookie idol groups. Here's hoping for 15 more years from Shinhwa!