It included the two #1 hits "Sin & Punishment (죄와벌)", which received numerous awards both for the music video and for the song itself, and "살다가 (While You Live)".

Like its predecessor, "Saldaga" was able to attract media attention for the group's vocal ability, thus SG Wannabe became the only artist in 2005 to sell more than 400,000 copies of their album.

On November 18, 2006, they released a greatest hits compilation entitled SG Wannabe Best Album - The Precious History.

Again, they amazed the audience with their new title song "Arirang" (아리랑), which had Korean traditional instruments playing as the background music.

[12] In addition, several changes also occurred within the band, with member Chae Dong-ha leaving the group in order to focus on a solo career.

[13][14] As of April 23, 2008, SG Wannabe's fifth album had 85,000 pre-orders and counting; it was released with a Japanese version of "I Miss You" (보고싶어).

They also released the song "운명을 거슬러" ("Fate Reverse", also translated as "Against Destiny"), featuring Kim Jong-wook, which was the soundtrack for the critically-acclaimed MBC drama East of Eden.

[31] Instead of promoting on music shows, they only appeared on You Hee-yeol's Sketchbook and performed live in four different open-air venues around Seoul from noon until 10pm on September 7.

[32] On March 27, 2021, the group appeared on Hangout with Yoo, marking the first time that the members had a live performance together as SG Wannabe since 2018.

The group's "second heyday" has been attributed to a domestic "retro" wave that has been going on for the past several years, as interest and awareness of older songs among the internet-savvy younger generation increased due to social media and online sharing platforms.

[42] On May 5, the group's former management MBK Entertainment, through their subsidiary PocketDol Studio, announced that it would release some of the recordings of their 2006 nationwide tour as a repackaged DVD entitled Do You Remember?.

[43] All three members, although now with different managements, immediately responded with a joint statement that none of them had been consulted on the matter, leading to accusations that MBK Entertainment was trying to profit from the group's renewed popularity.

[47] From the beginning, SG Wannabe was known for being a group focused on lyrical content and singing ability rather than following the kkonminam trend that was popular at that time.

[48] Kim Yong-jun and Kim Jin-ho later revealed in SG Wannabe's 2021 appearance on You Quiz on the Block that they were initially meant to debut as "faceless singers", an industry colloquialism for singers who are skilled vocalists and would release music but refrain from appearing on television as they do not meet South Korean societal standards for physical attractiveness.

They have been credited by domestic pop culture and industry commentators with popularizing the medium-tempo ballad centered on an emotional climatic refrain, which became a trend during the mid-2000s.

[55][56] When Lee joined the group, he provided an equally powerful singing style, albeit in the baritone range.

[51][57][58] Unlike many groups which debuted around the same time, there was no strict distinction between their lead and sub-vocals; instead whenever one member sang his line, the other two would harmonize or provide backing vocals.

After several controversies involving notable idol groups and artists lip syncing their performances, especially during the high-profile 2006 Mnet Km Music Festival, SG Wannabe themselves came under scrutiny for a period of time.

The incident was dubbed "Coughing Tree" by netizens and the video of the studio feed went viral on the internet and social media, dispelling doubts about their live singing abilities.