United Harmony TDY

United Harmony TDY (also known as TDY, Korean: 유나이티드 하모니 티디와이) is the second sub-unit of the co-ed group United Harmony. They debuted on August 22, 2024, with the mini-album "Monster".
==Career==
===2021-24: Pre-debut===
On January 3, 2021, it was revealed that the second subunit of United Harmony, TDY, would be debuting on the same year. The members were revealed to be Bos, Sia, Maria, Xristos and Daniel. They had their first song on United Harmony's first full album repackage, ||, titled "La Di Da", on February 23. However, after Sia left United Harmony on November of the same year, debut plans have halted. Although she has been unofficially replaced by Marina, no news about the sub-unit's debut have come out in over three years.
On March 23, 2024, a famous Dorman news outlet announced that United Harmony TDY was planning to debut officially on the second half of 2024. A few months later, Real Entertainment confirmed the rumors, and that both TDY and IFABY would be releasing mini-albums in the latter half of 2024. 
===2024: Debut with "Monster"===
They debuted on August 22 of the same year with the mini-album "Monster", and the title track of the same name.
==Members==
Name 	Year(s) active
Marina (마리나) 	2021–present
Bos (보스) 	2021–present
Daniel (다니엘) 	2021–present
Xristos (크리스토스) 	2021–present
Maria (마리아) 	2021-present
Pre-debut 	Pre-debut
Sia (시아) 	2021
==Discography==
*Mini albums
**Monster (2024)