Nattawat Jirochtikul (Thai: ณัฐวรรธน์ จิโรชน์ธิกุล; born 18 October 2004), known by his nickname Fourth (Thai: โฟร์ท), is a Thai actor under GMMTV^[1] and a singer under Riser Music. He began his career when he joined and won in the network's reality contest Thailand School Star 2019.^[2][3] In 2021, he made his acting debut as Glakao in the Thai adaptation of Boys Over Flowers, F4 Thailand: Boys Over Flowers.^[4] Fourth is known for his lead role as Gun in My School President (2022).^[5][6] Currently, he is to star as Atom in the upcoming series My Love Mix Up! (2024).

Nattawat was born in Bangkok, Thailand on October 18, 2004. He was nicknamed Fourth as he was born on King Rama IV's 200th birthday.^[7] His mother is from the Isan province of Sakon Nakhon.^[8][9]

He graduated from Saint Gabriel's College by taking the grade twelve equivalency test. He is currently studying Law at Chulalongkorn University.^[10]

At the age of fifteen, Fourth joined GMMTV's reality contest Thailand School Star 2019. He and Earn Preeyaphat Lorsuwansiri were chosen as the winners, both signing an exclusive contract with GMMTV.^[2][3]

In 2021, Fourth made his television debut in the role of Glakao Jundee, the younger brother of Gorya played by Tontawan Tantivejakul in the Thai adaptation of Boys Over Flowers, F4 Thailand: Boys Over Flowers.^[11] He also made a cameo appearance as a high school junior in Bad Buddy (2021).

In December 2022, Fourth starred in his first lead role; he played Gun, a high school music club leader, in the Boys' love series My School President. Gun is the love interest of the student body president, Tinn, played by Gemini Norawit.^[12] Airing in early 2023, while My School President was still ongoing, was also Moonlight Chicken where Fourth played Li Ming, the nephew of Uncle Jim (Earth Pirapat) and the love interest of Heart (also played by Gemini Norawit).^[13] The explosive popularity of My School President propelled Fourth to significant fame and led to a number of fanmeetings between the show's cast and fans across Asian countries. In mid-2023, Fourth reprised his role as Gun in two episodes of the anthology series Our Skyy 2.^[14]

Fourth and Gemini quickly became popular as "GeminiFourth", one of GMMTV's so-called "established couples", or actors who frequently appear together in romantic series and additionally participate in concerts, fanmeetings, promotional events and interviews together. In June 2023, Fourth and Gemini participated in the group concert Love Out Loud Fan Fest 2023: Lovolution alongside other GMMTV artists.^[15] In August, they headline their first concert together, Gemini Fourth My Turn Concert. Due to overwhelming interest in concert tickets, a second date was added, making the event two days.^[16]

In 2023, Fourth was supposed to appear alongside Gemini in the Girls' love series 23.5, but in July it was announced that they have withdrawn from the roles for personal reasons.^[17] In October, during the press conference GMMTV2024 Part 1, it was announced that Fourth and Gemini will star in main roles in the 2024 show My Love Mix-Up! เขียนรักด้วยยางลบi, a remake of a Japanese series.^[18]

On October 24, 2023, Fourth performed at The Filipino Festival, a cultural event held in Manila alongside a number of beauty pageants.^[19]

Fourth has also ventured into entrepreneurship with his own clothing line, Numone.^[20]