John Paulo Bagnas Nase (born September 14, 1994), known professionally as Pablo (formerly Sejun), is a Filipino singer, songwriter, rapper, dancer, and record producer.

He entered college at the Polytechnic University of the Philippines, and while on his senior year, he worked as a call center representative.

[8] Implementing the Korean idol training system, ShowBT Philippines conducted evaluations weekly by removing underperforming trainees.

[14] Pablo served as the main songwriter of the band's songs participating on all of the singles such as "Go Up" (2019) and "Alab (Burning)" (2020).

[20] The song focused about his feelings and beliefs[21] and acceptance of shortcomings free from society's unrealistic and unhealthy expectations.

[22] Pablo started his career in producing outside SB19 with hip-hop group PLAN B's R&B[23] song "Love" released on 13 April 2022.