The Affair Was Just the Beginning () is a 2026 South Korean black comedy television series written by Jung Eun-kyung and Park Soo-rin, directed by Lee Chang-hee, and starring Kim Hye-soo, Cho Yeo-jeong, Kim Ji-hoon, and Kim Jae-chul. The series follows an influencer couple and a doctor couple undergoing divorce proceedings who become entangled in a complex secret. It premiered on Coupang Play on July 31, 2026, and airs every Friday at 20:00 (KST). It is also available for streaming on Viu in selected regions.
Cast and characters Kim Hye-soo as Kyung-hee Cho Yeo-jeong as Su-jeong Kim Ji-hoon as Jae-hong Kim Jae-chul as Bo-seong
Production Development Lee Chang-hee, who helmed Strangers from Hell (2019) and A Killer Paradox (2024), was attached to direct, and the screenplay is co-written by Jung Eun-kyung and Park Soo-rin. The production is handled by Firstman Studio, co-founded by director Hwang Dong-hyuk, who created the acclaim Netflix series Squid Game, and producer Kim Ji-yeon. Hwang serves as both showrunner and executive producer.
Casting In September 2025, Kim Hye-soo and Kim Ji-hoon were considering.
In February 2026, Coupang Play confirmed the production of the series and revealed its casting lineup, which includes Kim Hye-soo, Cho Yeo-jeong, Kim Ji-hoon, and Kim Jae-chul.
Filming Principal photography began in January 2026, and ended after five months.
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