Season 2, starting on December 6, 2021, aired at 21:00 (KST) every Monday.

Note: This show airs on a cable channel/pay TV which normally has a relatively smaller audience compared to free-to-air TV/public broadcasters (KBS, SBS, MBC & EBS).Note 2: TNmS has stopped publishing their rating reports from June 2018 Famous Singer (유명가수전) is a Sing Again spin-off program that runs from April 2, 2021 – June 22, 2021.

It features the Top 3 contestants from Sing Again season 1.On the new program, the Top 3 finalists include winner Lee Seung-yoon, runner-up Jeong Hong Il, and third-place contestant Lee Mu-jin, will be meeting with Korea's legendary singers to talk about music and perform covers and collaborations.

Famous Singers and Street Judges (유명가수와 길거리 심사단) is the second spin-off program from Sing Again that runs from March 6, 2024.

It features the Top 7 contestants from Sing Again season 3.On the new program, the Top 7 contestants will leave the confines of the competition venue to tour the country, engaging in a novel road busking music show with a panel of street judges from various genders and generations.