Now it’s my time to share their history from 2004 to 2006 but before that let me say
For everyone who celebrate it 
After their official debut at the end of last year, they began activities as singers in Korea by releasing their first single entitled "Hug". When debut they using artificial image provided by the SM
Jaejoong image is mysterious, main vocal that should not talk and just sing
Yoochun image is International student and dandy boy
While Junsu image is luxury sexy
I don’t understand why Korean like to make artificial images like that, I mean why not let the artists be themselves, well this images in the end fail and disappear by itself and actually I'm much more like their original personality rather than artificial image made by SM 
At April 2004, Yoochun stayed in the hospital for some days due to eye disease. He was really upset that Junsu didn't visit him while all the other members did. Junsu explained that it was because he didn't have time because he had to go to school, but in the end Yuchun said "even thought he is annoying but I still Love you"
LOL Yoosu 
Besides "Hug" in 2004 they also release another single "the way you are" in June 2004 (and Somehow I always remember Yuchun when hear this song LOL) and also some other singles such as "Drive" if you look at the “Drive” MV then you will see that in that MV Yuchun had scene he is driving the car and 'Drive' is the first MV which put on Yoochun's role as driver, and in most of their MV with car Yoochun stuck with that role ever since 
On 13 October they released their first Korean album titled Tri-Angle, when Tri angle era Jaejoong and Junsu Hairstyle was the worst, that long hair is a nightmare 
2004 was also the first time Yoochun back to America after returning to Korea in 2003. They went to America to shoot Midhuyo MV and to join the LA Korean Music Festival at Hollywood Bowl (October 16, 2004.)
Besides release album and single in 2004 there also some rumor about them, during Miduhyo promo period (around November 2004) there’s rumor that SM would take Jaejoong and Yoochun out from group to create another group unit and replaced them with 2 new members (one was rumored to be taken from Chinese). This caused a huge chaos among the fans and fans turned to boycott all SM products which forced SM to cancel their plan, but JYJ3 ever posted that the one who actually will be kicked out from the group is not Jj or Yc but Yh, well I don’t know which one is true, well this is old story, past just past, I write this just for our information about their old story 
On November 24th they released International version of Hug, and that time Yoochun’s pronunciation still the best n perfect kekekeke
http://vimeo.com/31390845
They close 2004 with release Christmas Album special, and honestly I like the album cover
magic castle was part of this album.
End of 2004 for them, 
