Jang Deok Cheol are a South Korean male vocal group formed in 2015 that
comprises of singers Jang Jung-hyeok, Kang Deok-in and Im Cheol. The three
members were signed to the South Korean record label and management company
Limez Entertainment and after releasing four singles, all of which failed to
chart, suddenly had a chart-topping hit with the song "Good Old Days" in 2017.
The sudden change in the group's fortunes opened up a controversy within the
South Korean music industry amid rumours that Limez Entertainment had somehow
manipulated the charts. Their 2018 song "If I Knew.....