Siwat Jumlongkul, nickname Mark, is a Thai actor, singer, dancer, and model best known for his portrayal of Kengkla in the 2018 drama Love By Chance and its 2020 sequel, A Chance to Love. He is studying in the faculty of social communication at Srinakharinwirot University (SWU). He made his debut as a singer with his first digital single "Sigh" on October 9, 2020. He also owns his own clothing brand named "BLVR."