Wikipedia
H.O.T. ( Hangul: 에이치오티) was a popular five-member South Korean boy band in the mid to late 1990s. They were formed by SM Entertainment in 1996 and disbanded in 2001. In addition to South Korea, the band was popular in Taiwan, People's Republic of China and Korean and Asian communities in the Americas. H.O.T. was the first group to have an album become a "million seller" in K-pop, despite there being a financial crisis in South Korea at the time.
They are credited as the first K-pop boy band and the forerunners of the "idol group" trend in the Korean music industry, H.O.T. successfully turned mainstream Korean music into music for the younger generation. Made up of five teenagers at the time of their debut, they were formed to specifically target teenagers, hence their name "High-five Of Teenagers".