Giullian Yao Gioiello (born September 24, 1992) is an American actor, musician and songwriter. He is known for his portrayal of Gus in the Playhouse Disney/Netflix series Julie's Greenroom, BB on Marvel's Iron Fist, and Manny in VH1's Scream. He also officially released his first single "Goodnight Baby" on January 16, 2019, on streaming platforms under the name Tarune through an Instagram post. He has since released several other singles as a singer-songwriter, which have accumulated over 13 million streams on Spotify as of June 10, 2024. In June 2024, in an interview with Wonderland Magazine, he teased the release of his full-length album "let him cry", set to be released in Summer 2024.
Gioiello was born and raised in Manhattan, New York. He has a fraternal twin sister, Lucia Gioiello. He was raised by his father, Rick Gioiello who is from The Bronx. His mother, Shu-Fen Yao (), is of Taiwanese descent, and is the founder of Century Contemporary Dance Company. He attended Fiorello H. LaGuardia High School in New York City, and graduated the Tisch School of the Arts BFA Acting program at New York University in 2014.
Gioiello played actress Sandra Oh's son in the independent film Catfight which had its global premiere at TIFF in 2016. On September 13, 2017, it was announced that Gioiello was cast in the third season of the VH1 slasher television series Scream. He would star in the role of Manny. The season premiered on July 8, 2019. Later in 2019, Gioiello starred alongside his old The Carrie Diaries co-star Stefania LaVie Owen in the independent film The Cat and the Moon, which received a 78% score on Rotten Tomatoes. He later went on to voice the character of Troy in the breakout Netflix animated series Kipo and the Age of Wonderbeasts, which was released to rave reviews, receiving a 100% score for all three of its seasons. In 2023, Gioiello was cast as Jack in the Apple TV+ and A24 film Sharper, directed by Benjamin Caron. He played alongside actor Justice Smith.