Season 2 broadcast every Sundays at 18:30 (KST) starting March 26, 2017, after Running Man.

[3][4] On October 26, Fantastic Duo production team announced that season 2 would be end after the last recording on November 7,[5] whose the last regular episode was aired on December 10.

[7] In each episode, 3–4 Korean singers will compete each other in order to find and be the "Fantastic Duo".

Later a final performance will be conducted, and the duo which received the highest votes out of 300 audiences will be crowned as the winner.

In every episode, there would be a group of panelists that act as co-hosts, judges and commentators which could help the singer to choose his/her duo.

In season 2, the rules have been modified so now it features 2 (or 3) singers, each with their own panelists and sub-MC's in a team-styled match.

Through the application "EverySing", 6 candidates will be chosen and from there, 3 contestants will appear in the show (for each singer).

Note: the section labeled in gold is the winner Kim Gun-mo team: Kim Bum-soo team: Note: the section labeled in gold is the winner Note: Only 9 of 18 finalists participated in the Final Concert whose King of Kings' Final MVP's participant received a car as prize.

This special episode was broadcast on December 17, 2017, included the director's cut and the highlights of both two seasons.