Arm Weerayut Chansook is an actor, singer, model, MC and fashion designer under GMMTV. In 2015, he graduated with a bachelor's degree from the Faculty of Fine Arts at Srinakharinwirot University, majoring in Acting and Directing.

In 2007, Arm participated in the Luk Thung Star Contest where he placed as first runner-up. Later, he enrolled in a singing school. He started in the entertainment industry in 2010 as an artist under the record label RS Public Company Limited. With his singing and dancing abilities, he was selected as a member of Rookie BB, a boy band under the management of RS Music.