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On October 13, 2020, MLD Entertainment announced they would be launching a new boy group in December in partnership with NHN Entertainment Corporation and Sony Music. The group would debut not only in Korea but also in Japan and the United States, simultaneously. It was later announced that MLD had signed a business partner agreement with ICM Partners for activities in the U.S. The following day, a pre-teaser photo was released featuring all the members. On October 17, a schedule was released for the non-promoted pre-debut release, the group was said to be releasing a music video for "Dracula" on October 27.

On January 11, 2021, they debuted with their first single album, ''Before Sunrise Part. 1'', and its lead single "Asurabalbalta".

On March 31, 2021, T1419 returned with their second single album, ''Before Sunrise Part. 2'', and its lead single "Exit".

On August 23, 2021, T1419 released their third single album, ''Before Sunrise Part. 3'', and its lead single "Flex".

On December 2, 2021, T1419 released the digital single, "Red Light, Green Light".