Pre-debut Prior to their debut, Jongseob was a contestant on the
SBS reality program
K-pop Star 6: The Last Chance as a member of Boyfriend. He won the program and then signed with
YG Entertainment. Two years later, he joined the label's own survival show
YG Treasure Box as a member of Group C but was eliminated in the ninth episode. After leaving
YG Entertainment, he moved to
FNC Entertainment and eventually debuted with the group. In 2018, Intak appeared as a guest on the 10th episode of the
JTBC variety show ''I've Fallen For You.''
2020: Debut and Disharmony: Stand Out ' on November 14, 2020 In August 2020,
FNC Entertainment announced they were gearing up to debut a new boy group. On the 27th, the company released the teaser poster of the group's debut movie
P1H: The Beginning of a New World, which they described as a fusion project combining K-pop and K-movie. On September 1,
FNC Entertainment officially announced the name of their new boy group
P1Harmony, followed by a Logo Performance video. On September 8, 2020, the main teaser was officially unveiled on P1Harmony's official YouTube account. On October 8, the group's movie
P1H: The Beginning of a New World, starring the entire group, was premiered. On October 28, the group debuted with their EP
Disharmony: Stand Out and its lead single, "Siren". The group participated in writing the lyrics for the songs in the album. On December 29, the group released the full version of "Breakthrough" through an art collaboration planned together with fashion and culture magazine DAZED entitled "MIX HARMONY." The song was based on one of their debut songs "Intro; () Breakthrough" to which they expanded the meaning of the lyrics.
2021-2022: Disharmony: Break Out, Disharmony: Find Out, Gotta Get Back, Harmony: Zero In, and Harmony: Set In On April 20, 2021, the group made their first comeback with their second EP
Disharmony: Break Out and its lead single "Scared." On January 3, 2022, the group released their third EP
Disharmony: Find Out, and its lead single "Do It Like This". On February 26, 2022, the group began their first overseas tour
2022 P1Harmony LIVE TOUR [P1ustage H: PEACE] in Seoul and visited eight cities in the United States after. On March 10, 2022, the group released the English version of "Do it Like This". London on July 9, 2022On May 26, 2022, the group released their digital single "Gotta Bet Back" in collaboration with American artist
Pink Sweat$. The song was composed by
Pink Sweat$, while members Intak and Jongseob directly participated in the lyrics. On July 20, 2022, the group released their fourth EP
Harmony: Zero In, and its lead single "Doom Du Doom". On November 29, 2022, the group performed "Back Down," the lead single of their new EP which was set to be released the following day, on the
NBC daytime talk show
The Kelly Clarkson Show, marking their US TV debut. On November 30, 2022, the group released their fifth EP
Harmony: Set In and its lead single "Back Down".
2023: Harmony: All In, and Fall in Love Again On January 14, P1Harmony embarked on their second overseas tour
2023 P1Harmony Live Tour [P1ustage H: P1ONEER] where they visited 39 cities around the world. On April 21, the group released their digital single "Super Chic" in collaboration with British pop trio
New Hope Club. They participated in the lyric-making, composition, and arrangement of the song. On June 8, the group released their sixth EP
Harmony: All In, and its lead single "Jump". On the 21st, it was revealed that the album made entry to the
Billboard's Top 200 Albums chart. For the week ending on June 24, the album debuted on the Billboard 200 at No. 51. The group also debuted on Billboard's Artist 100 at No. 35, marking their first-ever appearance on the chart since their debut in 2020. On the same week, the album entered the Billboard's World Albums at No. 3, No. 8 on both Top Album Sales and Top Current Album Sales, and No. 11 on Independent Albums. On October 30, the original soundtrack of the KBS2 drama
The Matchmakers entitled
Half of My Heart by Theo was released. On November 8, the group released their digital single "Fall in Love Again" in collaboration with American producer
Tricky Stewart. On December 12, it was announced that the song sat at No. 40 of the U.S. radio chart
Mediabase, becoming the fourth K-pop boy band to enter the said chart. Intak and Jongseob participated in writing the lyrics of the song.
2024–present: ''Killin' It, Sad Song, and Duh!'' On February 5, 2024, P1Harmony released their first album ''
Killin' It'' and its lead single of the same name. P1Harmony received their first-ever music show win on February 16 on KBS2TV's
Music Bank. On April 27, the group embarked on their third overseas tour
2024 P1Harmony Live Tour [P1ustage H: UTOP1A] with a two-day show in
Seoul, followed by performing in 11
North American cities starting May 14. On May 13, the group released the English version of "Killin' It". The group released their seventh EP
Sad Song on September 20, with the lead single of the same name. P1Harmony's eighth EP
Duh! was released on May 8, 2025, alongside the lead single of the same name. The EP saw commercial success, scoring the group their highest first-week sales figures, with over 440,000 copies sold according to Hanteo.
Duh! also became their second record to debut atop the Circle Album Chart in South Korea, after ''Killin' It'' (2024). ==Members==