In the final episode, 11 out of the top 20 contestants were chosen to form the show's "project group" through a national fan voting system.

The group will disband after their contracts end, allowing the members of the final lineup to return to their respective agencies.

[5] On February 23, Mnet announced that BoA would be taking the MC role for this season, replacing Jang Keun-suk.

[7] Mnet announced the official broadcast of the show, which would replace High School Rapper's time slot, on March 8.

[15] On March 31, the participants performed their single "나야나 (Pick Me)" at the Gocheok Sky Dome ahead of a baseball game between the LG Twins and the Nexen Heroes.

In addition, Lee Dae-hwi threw the ceremonial first pitch to Brave Entertainment's Kim Samuel, at bat.

16 teams are formed to compete for 8 songs given: Super Junior's "Sorry Sorry", Shinee's "Replay", 2PM's "10 out of 10", B2ST's "Shock", Infinite's "Be Mine", EXO's "Call Me Baby", BTS's "Boy in Luv", and SEVENTEEN's "Mansae".

In between announcements of each trainee's ranking, events leading up to the elimination are shown, such as their dorm life, exercise and a hidden camera prank.

At the end of the episode, BoA announces that the team formation for the 4th mission, which is position evaluation, will be decided by online voting.

The trainees are tasked to perform live in groups based on positions they want to debut in: vocal, dance or rap.

There are five songs for vocals (I.O.I's "Downpour", BTS's "Spring Day", BoA's "Amazing Kiss", Blackpink's "Playing With Fire", and Jung Seung Hwan's "If It Is You") four songs for dance (Jason Derulo's "Get Ugly", NSYNC's "Pop", Ed Sheeran's "Shape of You", and Flo Rida's "Right Round") and four songs for rap (Mino ft. Taeyang's "Fear", iKON's "Rhythm Ta", Zico's "Boys and Girls", and Simon Dominic, G2, BewhY, and One's "Who You").

On the day of the stage performances, Super Junior's Leeteuk substituted BoA to host the show due to the latter's prior commitment.

[23] The episode opens with BoA treating the contestants to pizza before she temporarily goes overseas during the Position Evaluation filming.

She introduces the five songs: Hyuk Shin's "I Know You Know" (Synth-pop/Funk), Veethoven, Oh Sunghwan, Kiggen and ASSBRASS's "Oh Little Girl" (Hip Hop), ASHTRAY & KINGMAKER's "Show Time" (Nu-disco), Devine-Channel's "Open Up (열어줘)" (Future EDM), and Triple H's "Never" (Deep house).

Due to voting manipulation controversies, however, Kang Daniel, Lee Ki-won, and Kim Dong-bin are banned from their alleged preferred songs.

Amidst the eliminations, the trainees participate in a question relay and a team game event where "Open Up (열어줘)" group emerges as the winner.

They are also asked to vote for the top 6 pick for the debut team in the trainees among them, with MMO Entertainment's Yoon Ji-sung taking 1st place and Kang Daniel, Jung Se-woon, Park Ji-hoon, Ong Seong-woo, and Park Woo-jin taking 2nd to 6th place respectively.

After positions are confirmed, the trainees begin practicing the choreography and memorizing the lyrics in preparation for the final stage.

"Super Hot" group (composed of Ha Sung-woon, Kim Samuel, Kang Dong-ho, Yoo Seon-ho, Ahn Hyung-seob, Lee Dae-hwi, Choi Min-ki, Lim Young-min, Kim Jong-hyeon, and Lai Guan-lin) performs first with Ha Sung-woon as the center of the group, followed by "Hands on Me" group (composed of Kim Jae-hwan, Kang Daniel, Ong Seong-woo, Bae Jin-young, Hwang Min-hyun, Jung Se-woon, Joo Hak-nyeon, Yoon Ji-sung, Park Woo-jin, and Park Ji-hoon) with Bae Jin-young as the center of the group.

The top 20 trainees also perform together a special song titled "Always (이 자리에)" as a commemoration of their time throughout the competition.

Bae Jin-young, Hwang Min-hyun, Yoon Ji-sung, Lai Guan-lin, Park Woo-jin, Ong Seong-woo, Kim Jae-hwan, and Lee Dae-hwi are announced as 10th to 3rd place, respectively, confirming them for debut.

Kang Daniel once again receives the most votes, confirming his position as the center for Wanna One, with Park Ji-hoon in 2nd place.

Ilgan Sports reported that trainees encountered discrimination, such as level-determined permission to go to the bathroom and eat different meals.

[35] Maroo Entertainment's Han Jong-youn left the show due to a serious bullying and sexual assault scandal.

Screenshots of Instagram and Facebook conversations between him and minor fans were posted online, and he was also accused of sexually harassing and bullying an ex-girlfriend in middle school.

MMO Entertainment's Kang Daniel reportedly indicated which song he preferred by altering the number of cat emojis in his Instagram biography at the request of a fanpost on a community site.

Mnet decided to penalize the trainees that failed to follow the rules by banning them from choosing the songs in question.

A subsequent statement said that the posts in question were made by the agency in an attempt to increase Lee's popularity while he was allegedly sleeping and unaware.

[109] In June 2020, the charges of fraud were dropped by The Seoul Central District Prosecutors’ Office, citing lack of evidence.

[109] In November 2020, the Seoul High Court disclosed that Seong Hyun-woo and Kang Dong-ho were the two trainees who were victims of the voting manipulation done by the show's producers.