P1Harmony's THEO Stuns on Leemujin Service With Covers That Reveal a Completely New Side

P1Harmony’s THEO just gave fans a reason to see him in an entirely different light. The vocalist appeared as the latest guest on KBS Kpop’s beloved live performance show Leemujin Service, delivering a four-song set that ranged from his group’s own material to deeply emotional Korean ballad covers — and the performance is already making waves among fans who thought they knew everything about him.

The episode, which marks the 206th installment of the popular YouTube series hosted by singer-songwriter Lee Mujin, arrives at a particularly significant moment for P1Harmony. The six-member group is riding the highest wave of their career following the release of their ninth mini album UNIQUE on March 12, which shattered their previous sales records within hours of its debut.

From Brazilian Funk to Tearful Ballads — THEO’s Stunning Vocal Range

THEO opened the session with “Wednesday Girl,” a track that immediately established his command of the intimate Leemujin Service setting. Stripped of the high-energy choreography and elaborate staging that typically accompanies P1Harmony’s performances, the song took on a more personal quality that highlighted the texture and warmth of his voice.

But it was the cover selections that truly surprised viewers. THEO’s rendition of Nerd Connection’s “Will We Become a Song” showcased a tender, reflective side rarely seen in the group’s typically powerful performances. The indie ballad, beloved for its gentle melody and poetic lyrics, became something unexpectedly moving in THEO’s interpretation, with Lee Mujin himself visibly impressed by the vocal delivery.

The emotional depth only intensified with his cover of Lyn’s iconic ballad “Back In Time,” a song that has remained one of Korea’s most cherished love songs since its release. THEO’s approach to the track demonstrated a maturity and emotional intelligence that belied his years as an idol performer, navigating the song’s soaring passages with a control that drew immediate praise from viewers in the live chat.

The set concluded with a powerful rendition of Huh Gak’s “Monodrama,” originally performed with Yu Seungwoo. The theatrical ballad, known for its dramatic emotional arc, proved to be the perfect closing statement — a performance that left no doubt about THEO’s credentials as a vocalist capable of commanding any genre.

A Career-High Moment for P1Harmony

THEO’s Leemujin Service appearance comes amid what can only be described as the most successful period in P1Harmony’s career. The group’s ninth mini album UNIQUE — which tells the story of heroes returning after declaring a strike in their previous release DUH! — has exceeded all expectations since its March 12 release.

The album moved over 450,000 copies on its first day alone, surpassing the entire first-week sales of their previous release in a single day. It claimed the number one position on both the Hanteo Chart daily album chart and the Circle Chart daily retail album chart on its release date. By March 13, UNIQUE had climbed to number five on the Worldwide iTunes Album Chart, with Top 10 placements on iTunes charts in the United States, Turkey, Russia, Thailand, Argentina, and Brazil.

The album’s momentum continued through its first full week, securing the number one spot on the Hanteo Chart weekly album chart for the period of March 9 through 15. The title track “UNIQUE” — built on a foundation of Brazilian funk rhythms and heavy drum patterns — carries a message of confidence and unbreakable team bond, themes that have clearly resonated with the group’s growing global fanbase.

Why This Appearance Matters Beyond the Music

For P1Harmony, THEO’s solo spotlight on one of Korea’s most respected live performance platforms represents something larger than a single promotional appearance. Leemujin Service has become a benchmark for vocal ability in the K-pop industry, with appearances serving as a public testament to an artist’s raw talent. The show’s stripped-back format — no backing tracks, no elaborate production, just a microphone and a musician — leaves nowhere to hide.

The fact that THEO chose to perform not just P1Harmony’s own material but also beloved Korean classics speaks to a confidence that comes from knowing exactly where he stands as a vocalist. His selection of songs spanning indie, ballad, and theatrical genres demonstrated a versatility that fans and industry observers alike have been eager to see explored.

P1Harmony returned to domestic stages after a 10-month hiatus with UNIQUE, kicking off their comeback week with appearances on Mnet’s M Countdown, KBS2’s Music Bank, MBC’s Show! Music Core, and SBS’s Inkigayo. The group also appeared on Studio Choom and various web variety shows, showcasing not just their performance skills but also a playful chemistry that has endeared them to Korean audiences.

With all six members — Keeho, THEO, Jiung, Intak, Soul, and Jongseob — contributing to the songwriting across the album, UNIQUE represents P1Harmony at their most creatively involved. The album sampler behind-the-scenes footage released on March 16 revealed the group’s meticulous approach to their craft, alternating between lighthearted moments and focused monitoring sessions that spoke to their professional dedication.

What Comes Next

As P1Harmony enters their second week of promotions for UNIQUE, the group shows no signs of slowing down. Their continued presence on music shows, combined with individual member activities like THEO’s Leemujin Service appearance, suggests a promotional strategy designed to showcase every dimension of what makes P1Harmony unique — from their explosive group performances to the individual artistry of each member.

For fans who have followed P1Harmony since their 2020 debut under FNC Entertainment, this era feels like a turning point. The numbers tell one story — career-high sales, global chart dominance, and a fanbase that continues to grow across continents. But it is moments like THEO sitting across from Lee Mujin, stripping a ballad down to its emotional core, that tell another story entirely: one of artists who are only beginning to show the world what they are capable of.