Nattanon Tongsaeng (ณัฐนนท์ ทองแสง; born September 14, 1999), nicknamed Fluke (ฟลุ๊ค), is a Thai singer and actor under GMMTV. He is currently attending the Faculty of Fine And Applied Arts at Thammasat University, majoring in Theatre. He is known for participating in GMMTV's reality survival show "Project Alpha" in 2022. He made his acting debut in 2022 with a supporting role in the series "Makkali The Love Tree" (มักกะลีที่รัก).