Pirapat Watthanasetsiri (Thai: พิรพัฒน์ วัฒนเศรษสิริ; also known as Earth (Thai: เอิร์ท), born 23 February 1994) is a Thai actor. He is known for his main roles as Waii in Water Boyy: The Series (2017) and So in Kiss Me Again (2018). His fame further skyrocketed through his title role as Chief Phupha in the widely-successful television series A Tale of Thousand Stars with Sahaphap Wongratch.

Pirapat was born in Bangkok, Thailand. He graduated in 2018 with a bachelor's degree in performing arts from the Faculty of Fine Arts at Srinakharinwirot University.^[1][2] In addition to being an actor and singer, Pirapat also paints as a hobby.^[3]

In 2018, Pirapat's mother passed away. Before her passing, he was in a car accident while on his way to see her in the hospital. He was uninjured but speaks about this period in his life as a particularly difficult one.^[3]

Pirapat is the owner of a chain of Thai massage parlors named "Nikko Thai Massage" and located in Bangkok. The first branch opened in January 2023, and the second - in June 2023.^[4][5]

In August 2023, Pirapat took to X (formerly Twitter) to complain about letters containing malicious content being sent to his business. He threatened legal action unless the malicious mail stopped. ^[6] Later that month, Pirapat's management company, GMMTV, issued a statement that it had met with inspectors and taken legal action against an individual whose actions defamed Pirapat and damaged his image. According to the statement, the individual agreed to cease this behavior. The company further stated that it would take such action against similar behavior in the future.^[7]

Pirapat is an artist with GMMTV. He has starred in multiple TV shows and is best known for the BL (Boys' Love) series A Tale of Thousand Stars where he played the lead role of Chief Phupha opposite fellow GMMTV actor Sahaphap Wongratch.^[8] The two actors' chemistry was praised by audiences and led to their work together in multiple future shows where they starred as leads. Among fans, the two are known as "EarthMix". In 2022, they debuted their own variety show on YouTube titled E.M.S Earth - Mix Space.^[9]