"R" Arnuttaphol Sirichumsaeng is a Thai singer and actor under The One Enterprise (เดอะ วัน เอ็นเตอร์ไพรส์). His birthplace is Udon Thani, Thailand. R began his career in the entertainment industry as a competitor on "The Star" (เดอะสตาร์ ค้นฟ้าคว้าดาว), a Thai version of "American Idol" show, winning first place in the third season.