Idol groups weren't really popular in Korea... that is until H.O.T. came along. They basically reshaped the Korean music landscape overnight and this was their debut track.

With the huge success of H.O.T., rival entertainment companies wanted to emulate the boy idol group formula and formed their own boy groups. The biggest rival to H.O.T. was none other than Sechs Kies. Check out their song "Chivalry" although they weren't quite chivalrous in the beginning with the random curse words.

Some of you may know DJ Koo but back in the day he was in the group Clon. This MV today would be banned and receiving a 19+ rating but back in the day, there was no controversy at all.

Little did Yoo Seung Joon know that his life would become somewhat of a "Nightmare" a few years after his debut with the military issue. He was one of the biggest stars in K-pop and you can check out his debut song above.

You may know of Jinusean because of their recent comeback but back in the day they were YG royalty and "Tell Me" was a huge hit in 1997 featuring the gorgeous Uhm Jung Hwa.

You may know Kim Jong Kook from 'Running Man' but before he was Sparta Kook, he was a member in Turbo.

Before he was JYP, he was Park Jin Young. There hasn't been another entertainer in K-pop history like the one and only J.Y. Park. He brought fashion, flair, and good old fashioned groove to the industry.

If you've ever hit up the NRB (noraebang or Karaoke) with a hyung, you've probably heard him sing this song. There have been other awesome songs from soundtracks but nothing on the level of this song from one of great dramas in Korea, 'Star in My Heart'.

No other group had more of a let's-have-fun attitude than the bad boys of K-pop. The other tracks on their legendary 4th album were a bit controversial with harsh words towards censorship in Korea but this track was a hit because of its carefree nature.

Another great song from Turbo back in the day.

It's been nearly 20 years since the release of this song but it's still considered a great summer anthem.

With the success of H.O.T., SM Entertainment wanted to replicate that idol group formula but this time with a girl group. S.E.S debuted to much fanfare with "I'm Your Girl."

You've probably heard this song before covered by Super Junior but the original was done by H.O.T. This song is the one that brought them to the top of K-pop.