Entertainment in 2003 and released their debut single "Hug" in January 2004, peaking at number four on the Monthly Albums Chart of the Music Industry Association of Korea (MIAK).

The album's title single became one of TVXQ's biggest worldwide hits – it topped digital charts across most major Asian music markets, and became a signature song for the Hallyu.

The group's fourth Japanese studio album The Secret Code, released in March 2009, repeated Mirotic's success, spawning four number-one singles on the Oricon.

(2008) was the album's best-selling single, receiving a gold certification from the Recording Industry Association of Japan (RIAJ) after only one week of release.

"Keep Your Head Down" is one of TVXQ's biggest hits in Japan; it topped music charts across the country, earning a platinum certification in digital downloads.