The producers of JTBC's music competition show “Sing Again” have teamed up - again - for the new survival show, “Peak Time,” to offer a second chance to lesser-known, underrated K-pop singers. The network's new music show, which kicked off Wednesday, invites 24 boy groups who have not been able to perform for various reasons; like being disbanded, under indefinite hiatus, or newly debuted with no fame. Despite their musical talent, they haven't had a chance to shoot to stardom or even make themselves known to the public.