Bo A's second Japanese studio album, Valenti (2003), became her best-selling album, with over 1,249,000 copies sold.Later that year, she released two Korean albums, Atlantis Princess and the mini-album Shine We Are! The former was the fifth-best-selling South Korean record of the year with around 345,000 units sold; the latter sold around 58,000 units.

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After the release of Listen to My Heart, Bo A released her second Korean studio album, No. The album sold around 544,000 units and became the fourth-best-selling record of the year in South Korea.

Jumping into the World (a Japanese re-release of the mini-album Don't Start Now) and the Japanese single "Don't Start Now" were released a month later on the same day. It peaked at the number-two position on the Oricon chart.

After the September 11, 2001 attacks, Bo A recorded the charity single "The Meaning of Peace" with Kumi Koda as part of Avex's Song Nation project to raise funds for charity.

Her debut Japanese album, Listen to My Heart, was released on March 13, 2002.

The tour, which lasted until October 29, started from Nagoya and contained twelve shows, two in each of the following cities: Nagoya, Fukuoka, Osaka, Tokyo, Sendai, and Sapporo.

She staged her first Christmas concert on December 7, 2006.

On September 21, 2006, she released her first digital single in Korea, a Korean version of "Key of Heart".

In support of Outgrow, Bo A launched a special Zepp tour, B0A The Live, on September 29, 2006.

With 220,000 copies sold, it became her lowest-selling first-week debut for a studio album at that point.

"Merry Christmas from Bo A" (2005), the album's last single, was the singer's first digital single.

In May, Bo A renewed her contract with SM Entertainment until 2012.