HBY (Meaning: Hot Blood Youth, Hangeul: 열혈남아, Also Known as: H.B.Y), is a 4 member (was 5) South Korean boy group that debuted on August 16, 2017 under Rainbow Entertainment.

The members are Kyuhyuk, Jisan, Marco and Taro.

Debut: 2017
The group debuted with the single "Make It Ride". The line up of the group was Bin, Kyuhyuk, Jisan, Marco and Taro.

2019
In March 2019, the group released their 2nd single album Yolo. The album contains the title track "BBANG" (지구뿌셔). It also contains the tracks "TAM TAM" and "내 품에 안겨". (Nae Pume Angyeo). The group's line up for this was Bin, Kyuhyuk, Jisan, Marco and Taro.
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