'BTOB' Lee Chang-sup has announced that he will be cleaning his eardrums.

Lee Chang-sup will release the pre-release single “PRE-RELEASE 1991” of his first full-length album “1991” on major music sites at 6 p.m. on September 2.

The pre-release single contains a total of five tracks. The title track is 'Hope Torture'. Lee Chang-sup's warm and deep voice is impressive. It completes the mournful atmosphere.

A representative said, “It sings about the hurt of hot and affectionate love,” adding, “Lee Chang-sup's lonely and deep emotional lines are expected to resonate with listeners.”

'NEW WAVE' has a cool atmosphere that matches the summer. 'Golden Hour' captures the ambition to overcome difficult moments and move forward.

“STAY (幻)” has a grungy beat and a wistful voice that makes you feel like fall. “#RUN” features Lee Changsub's vocals that change depending on the genre.

Lee Changsup held a listening party 'OPEN STAGE' last month. He sang 'Hope Torture', 'Stay', and '#RUN'. He attracted attention with his solid live performance.

The agency said, “Lee Changsub has shown his musical confidence by taking the unusual step of releasing five new songs before the official album release. Please look forward to the results.”