A weekend festival celebrating the versatile artist Martin—singer, rapper, and producer—turning 20 will be held for two days in Yongsan-gu, Seoul. At The One The Matrix, which offers special gifts and events from the first day through the last, fans can share small moments and enjoy a celebratory atmosphere different from everyday life. The venue is Romble 378 (Yongsan-gu, Hangang-daero 10-gil 11-54), and the event will take place from March 20 to 22, 2026. At the same time, Baby Teen events, featuring a curated selection of Martin’s adorable moments, will be held at Delroo (Yongsan-gu, Hangang-daero 10-gil 11-42) on both March 20 and 21, so enjoy a time focused solely on his cute charm. Programs and surprise gifts prepared for each space are waiting for you. For detailed café information, please check the link below.