[citation needed] On January 31, 2021, Big Hit announced that 8Eight would make a comeback in February with a new commemorative single composed by "Hitman" Bang and Wonderkid for the 10th anniversary of "Without A Heart".

A duet featuring singer Lim Jeong-hee,[9] it was written by Bang Si-hyuk as the final part of his Goodbye trilogy of songs that included Baek Ji-young's "총 맞은 것처럼" ("Like Being Hit By a Bullet") and 8Eight's "심장이 없어" ("Without a Heart").

[10] An accompanying music video, starring actress Sunwoo Sun, was released alongside the single without any copyright restrictions to encourage viewers to share it freely.

[12] He also participated in the original soundtrack for the KBS2 television series Invincible Lee Pyung Kang, contributing the single "숨이 막혀" ("I Can't Breathe"), which was released on November 2.

[13] In 2010, Lee recorded the song "왜 나를 울려요" ("You Make Me Cry") for the soundtrack of the SBS television series Big Thing; it was released as a single on October 27.

[22] Following its expiration at the end of January 2018, Big Hit announced on February 1 that Changmin had chosen to leave the company and open his own agency; Lee remained with the label as a soloist.

The musical ran from January 9 to 20, 2013, at the National Theater of Korea and co-starred actors Ji Hyun-woo, Kim Mu-yeol, and Jung Tae-woo, and singers Leeteuk of Super Junior and Yoon Hak of Supernova.