Chisanupong Puangmanee (Thai: ชิษณุพงศ์ พวงมณี; born 21 September 2001), nicknamed Smart (Thai: สมาร์ท) is a Thai actor and musician. He is known for his roles in Don't Say No (2021) and Top Form (2025). He also releases music under the name CSNP.
Early life and education
Smart Chisanupong Puangmanee was born September 21, 2001, in Khanom, Thailand. He describes himself as a shy but mischievous child and an introvert. He was staying with an uncle in Bangkok when he was approached by a modeling agency and invited to work in the entertainment industry and found he enjoyed it. His first job was "being a Smart Boy for Channel 7". He studied at Chandrakasem Rajabhat University in Bangkok.
Smart was introduced as a trainee under YOMA Entertainment in 2021. In 2022 he was revealed as a member of a co-ed group called SPF+ Project, with a group debut on December 16, 2022, with a digital single "Fish N Fly". The group disbanded after a few years.
Career
In 2021 Smart was cast in his first BL series, Don't Say No the series. He played Leon, the younger brother to Ja Pachara's character Leo. He was paired with James Pongsapak, and the two were praised for their on-screen chemistry. A spinoff series focused on their pairing, called Just Say Yes, was announced but not produced.
In 2024 Smart was cast in a lead role for the live-action adaptation of the Japanese manga Dakaichi, alongside industry veteran "Boom" Raveewit Jirapongkanon. The series, titled Top Form, was produced by WeTV in cooperation with Tailai Entertainment. The first episode released in March 2025.
Top Form was praised for its adherence to the source material as well as the chemistry between the two leads, and trended worldwide for every episode. Smart and Boom were announced as an official CP in May and nominated for several awards, including Best Couple of the Year for the Thailand Box Office Awards.
On August 30, 2025, Smart made his solo music debut under Grand Ivory Records with a mini-album titled "Call Me CSNP", followed by singles titled "Low Batt" and "All Night".
Controversy and WeTV Lawsuit
During the production of TopForm, Smart was represented by a collaborative partnership between Grand Ivory Records(GIR) and Image Future (Headliner TH). In May 2025, GIR announced that this collaboration had ended, setting off speculation with fans. However, GIR assured fans that the SmartBoom partnership would continue.
In June 2025 WeTV Thailand and Headliner Thailand announced that all previously announced couple events for Smart and Boom had been cancelled due to contract disputes.
On 13 March 2026, WeTV announced a lawsuit against Smart and his agency, Grand Ivory Records, citing breach of contract.