| Director | Son Jae-gon |
|---|---|
| Box office | $9 million |
In 2001, nineteen-year-old dancer Hwang Hyun-woo is discovered by small-time producer Park Yong-gu and recruited into a new co-ed pop group called Triangle. Alongside rapper Gu Sang-gu and vocalist Byeon Do-mi, he trains for a year before debuting with the hit song "Love Is" and quickly becoming one of the biggest acts of their generation.
At the height of their fame, however, everything collapses overnight. During a celebration party, rival singer Choi Seong-gon is unknowingly drawn into a drug scandal that destroys his career. At the same time, Triangle discovers they have never received proper payment for their work. Soon afterward, news breaks that their hit song was plagiarized, despite being publicly credited to Hyun-woo. Before the group can respond, producer Yong-gu flees the country, abandoning them and leaving them to face the backlash alone. As tensions rise, Do-mi decides to leave, and Triangle disbands in disgrace.
More than twenty years later, Hyun-woo is a forgotten celebrity surviving on minor radio and television appearances. After being dismissed from yet another program, he receives an unexpected opportunity: Triangle is invited to reunite for a major concert, and a successful performance could lead to a new television music show. Determined to seize what may be his last chance, Hyun-woo sets out to reunite the estranged members despite their unresolved conflicts.
He finds Sang-gu struggling with debt after failed solo ventures and working as an insurance salesman. Do-mi, meanwhile, lives comfortably as the wife of a wealthy businessman but feels trapped in a dull life dominated by family expectations. Though both initially resist, Hyun-woo gradually convinces them to return. At the same time, former star Choi Seong-gon, whose career was ruined by the scandal decades earlier, is also invited to perform at the concert, hoping for a comeback of his own.
As the reunion approaches, the group unexpectedly encounters Yong-gu, who has secretly returned to South Korea under a new identity after years abroad. Furious over his betrayal, their pursuit of him leads to a chaotic series of accidents, failed rehearsals, and misunderstandings, putting their concert appearance at risk. After countless setbacks, they finally reach the venue at the last moment and take the stage. Instead of recreating their old performance, they reinvent it: Sang-gu adds new rap verses inspired by his life, Do-mi showcases her vocal talent, and Hyun-woo unleashes the breakdancing skills that made him famous. The audience responds with overwhelming enthusiasm, proving that their music and bond still resonate after all these years.
Afterward, Do-mi returns to her family life but remains involved as the group's producer. Hyun-woo and Sang-gu continue to perform as a revamped version of Triangle, with Seong-gon joining as the new vocalist.