Kingdom: Legendary War

The program is a battle behind six trending K-pop boy groups: BtoB, iKON, SF9, Ateez, The Boyz, Stray Kids.The program features 4 rounds of performances, with the final round being broadcast live.

The winner of the show will get a reality show specially for the winning boy group, plus a "Kingdom Week" special shows.

A preliminary competition, titled Road to Kingdom, aired from April 30 to June 18, 2020. The Boyz won the competition, securing a spot in Kingdom.^[2] On December 6, through the 2020 Mnet Asian Music Awards, the first lineup for Kingdom was announced, and it consists of Road to Kingdom's winner The Boyz, alongside Stray Kids and Ateez.^[3][4]

On January 22, 2021, Mnet confirmed that the hosts of the show will be TVXQ.^[5][6] Six days after, the network confirmed that iKON, SF9, and BtoB would join the lineup.^[7]

On February 17, 2021, Mnet released the first trailer and announced a global live broadcast of the 100-second group introduction performances which is to be aired on February 23, 2021, via Mnet's YouTube channel.^[8]

On March 16, 2021, Mnet released performance posters and announced a special stage featuring members from each group that was shown during the March 18 episode of M Countdown.^[9]

The show was aired simulcast on Mnet Japan, AbemaTV in Japan and tvN Asia a day after the domestic broadcast.^[10]

The final episode aired live and was live streamed on Mnet's YouTube channel.

• Max Changmin of TVXQ

• BtoB^[a][b]
• iKON
• SF9^[c]
• The Boyz^[d]
• Stray Kids^[e]
• Ateez^[f]

The overall final ranking of the show is based on the following criteria:^[12][13]

1. Self-evaluation points (25%)
2. Experts' voting (25%)
3. Global voting (40%)
4. Performance video view count (10%)

The six boy groups will each perform one of their hit songs (that have won 1st place in a music show) for a 100-second performance that will best express themselves.

The six boy groups each perform one (or two) of their representative hit songs, which are rearranged and different from their usual stages of the song.

The six boy groups will exchange songs, perform and rearrange them into different styles.

The premise of "No Limit" is that there are no restrictions for the performances in this round. A total of 40,000 points will be awarded in this round.

This round will be divided into two parts. The first parts involves the six individual groups being sorted into two larger teams (selected by Ateez, the highest scoring team in the previous round in terms of the total points in experts' votes plus self-evaluation). Each large team then divides its members into three smaller units - a dance unit, a vocal unit, and a rap unit, based on each individual idol's specialty. The corresponding units in each group will go against each other over three rounds - dance, vocal, and rap. The winning group in each of the three rounds will earn 5,000 points, which will be evenly distributed. The awarding of points is solely based on which group won each round. A total of 15,000 points are up for grabs.

The second part will be back in individual groups, with a total of 25,000 points to be distributed, in the same way as the other rounds. However, for the idol group's self-evaluations, each group can only vote for two teams, instead of three in previous rounds.

The six boy groups will each perform a newly produced song live on the final episode. The new songs will be released digitally on May 28, 2021, at 12:00 (KST).

In the ratings below, the highest rating for the show will be in red and the lowest rating for the show will be in blue.

On March 29, 2021, controversy arose following the reports from industry representatives of an issue in the midst of recording performances during round one. Each group were notified the maximum budget for stage decoration would be ₩5 million won (approximately $4,416) per team. However, during the recording, agencies from groups who comparatively did not have an extravagant set and props that appeared to be far over the budget reportedly confronted the production team on the matter and questioned if it was due to CJ ENM investing in the other group's agency. According to the report, the production team countered by stating it was because the group's props were from their concert, but as the other groups have also had concerts with props that could've been used, their agencies continued to speak out.^[28]

In response, during the press conference held on April 1, CP Park Chan-wook stated: "I apologize that an issue was raised ahead of the show's premiere. But we did not have to halt the recording due to someone's complaint. There was also no favoritism towards a certain team. I hope that the six teams and their agencies were not harmed by this issue. For round two, we had discussions with each agency about the parts that were lacking in round one. We have all negotiated and agreed on a way to bring out each team's creatives well. Starting round three, with the conditions that all six teams have agreed on, we will make sure that there are no more issues like these."^[29]

Names of performing members that have also contributed to the songwriting will be highlighted in bold. The information below is detailed according to the songwriting credits available on the respective full performance videos uploaded on Mnet's official YouTube channel.

• Official website (in Korean)
• Kingdom: Legendary War at IMDb
• Kingdom: Legendary War on Naver TV (in Korean)