Well, I can't believe that Itaewon has taken a 180 degree turn in terms of popularity among Korean youth. Until late 2000s it was a place that Koreans hate to visit and it was left almost entirely to the expats. The article below tells a different story about Itaewon:
Where is the hottest spot for young people in Seoul at the end of the week?
KB Kookmin Card analyzed the spending habits of 4.2 million of its travel card users on Friday evenings between the hours of 6 p.m. and 10 p.m. in February and March of this year. Itaewon subway station was the most frequented stop. On Friday evenings, 10,883 of its travel card users disembarked there, a 2.4-fold increase from other weekday periods.
Itaewon is especially popular among young women.
Itaewon has become a top spot to enjoy a second round of drinks after dinner.
One of the main attractions of the area is the recent explosion of unique bars and eateries there.
Park Jeong-lim is one of a number of single 30-somethings who has grown tired of partying in the student-friendly Hongik University area. She now prefers spending her Friday nights at more sophisticated haunts in cosmopolitan Itaewon.
"The Itaewon area has begun offering an ever-more eclectic mixture of unique restaurants and bars in recent years, making it the place to go on a Friday night," said Choi Chang-ryong at KB Kookmin Card.