In addition to playing the soap opera, Chelsea who are Protestant is busy singing with BBB (Bukan Bintang Biasa, Korean: 보통하지 별, Botong Hachi Byul), a Korean wave-type group singer made up from younger soap opera stars such as: Laudya Cynthia Bella, Raffi Ahmad, Dimas Beck dan Ayushita under the guidance of singer and songwriter Melly Goeslaw.
He founded JYP Entertainment in 1997, composing and producing several singles and albums for various singers in South Korea including Rain, g.o.d., Park Ji-yoon, Byul, Wonder Girls, 2AM, 2PM, miss A, JJ Project,15&