South Korean boy group CORTIS officially made their highly anticipated Southeast Asian stage debut at Allo Bank Festival 2026, delivering a spectacular performance that instantly electrified Indonesia Arena in Jakarta on Saturday night.

The moment thousands of fans had been waiting for finally arrived as the group stepped onto the stage, opening their set with the explosive hit “TNT.” From the very first beat, the atmosphere inside the packed arena transformed into a sea of excitement.

A Powerful Debut in Southeast Asia

CORTIS wasted no time making an impression.

Enhanced by stunning lighting effects and dynamic stage visuals, the group’s opening performance created a breathtaking spectacle that captivated the audience from the first minute.

Before launching into “TNT,” leader Martin sent the crowd into a frenzy with a simple but effective shout in Indonesian.

“Indonesia, where’s your voice?”

The response was deafening.

As soon as the familiar opening notes of “TNT” filled the arena, thousands of COER—the group’s dedicated fanbase—joined in, singing every lyric at the top of their lungs. The massive singalong echoed throughout Indonesia Arena, creating a memorable moment that perfectly marked CORTIS’ first-ever performance in Southeast Asia.

Without slowing down, the group transitioned straight into “RedRed,” their chart-topping hit that recently surpassed 100 million streams on Spotify, sending the crowd into another wave of excitement.

photoby : allobankfest2026

“How Are You, My Darlings?”

While their performances impressed fans, it was the members’ heartfelt interactions that truly won over the audience.

One of the night’s loudest reactions came when Martin greeted fans with an affectionate phrase in Indonesian.

“Apa kabar ayang-ayangku?” (“How are you, my darlings?”)

The unexpected greeting immediately triggered screams across the venue.

He followed it up with another warm message:

“Hello everyone, thank you for coming.”

The personal touch highlighted the group’s effort to connect with Indonesian fans during what was a historic night for both CORTIS and COER.

photoby : allobankfest2026

Celebrating a Major Global Milestone

During the talk segment, the members also celebrated a significant achievement in their career.

Their hit single “RedRed,” the lead track from their second EP, GreenGreen, recently crossed the milestone of 100 million Spotify streams, reaching the mark just 57 days after its release.

Speaking about the group’s growing popularity, Martin credited CORTIS’ success to the dedication of every member.

According to him, all members actively participate in the creative process, from the early stages of songwriting and production to the completion of each album.

The group has also built a strong online presence through engaging social media content, something Martin acknowledged would not be possible without the support of their hardworking team behind the scenes.

“We all have different interests, but there are also things that we enjoy together,” Martin shared.

Local Humor Creates Unforgettable Moments

The fun didn’t stop with the music.

James later encouraged fans to learn a special hand gesture associated with “RedRed.” However, the arena erupted in laughter when the background music unexpectedly switched to the viral Indonesian song “Kicau Mania.”

The surprise instantly turned the venue into a giant dance party, with fans, the members, and even host Indra Herlambang joining in on the fun.

The cultural exchange continued when each member was challenged to say popular Indonesian slang and viral phrases.

The results delighted fans.

Martin confidently said, “Sans aja.”

James followed with, “Iziin.”

Juhoon drew laughter with his playful delivery of “Jyujyur janggal.”

Meanwhile, Keonho charmed the crowd by introducing himself as “Halo, aku dedek Keonho,” before Seonghyon completed the sequence with a firm “Sepakat.”

The lighthearted interaction showcased the members’ willingness to embrace local culture and created some of the most memorable moments of the night.

A Night to Remember for Indonesian COER

CORTIS’ debut performance at Allo Bank Festival 2026 was more than just a concert appearance—it was a celebration of the connection between the group and their Indonesian fans.

From explosive performances of “TNT” and “RedRed” to playful local interactions and heartfelt fan engagement, the group delivered a complete entertainment experience that left a lasting impression on everyone inside Indonesia Arena.

Alongside CORTIS, the festival also featured performances from popular Indonesian acts including Naykilla, Agak Laen, TENXI, Rizky Febian, Mahalini, NPD, Juicy Luicy, and King Nassar, making Allo Bank Festival 2026 one of the most exciting music events of the year.

For Indonesian COER, however, this unforgettable night belonged to CORTIS—a debut that exceeded expectations and marked the beginning of a promising relationship with Southeast Asian fans.