The album sold 600,000 copies within several days .
The album would go on to sell over 1.8 million copies , making them the first group since Seo Taiji & Boys to surpass the 1.5 million mark .
The album sold 600,000 copies within several days and would go on to sell over 1.8 million copies , making them the first group since Seo Taiji & Boys to surpass the 1.5 million mark .