What happens when a relationship that has lasted for a decade is shaken by unexpected feelings?

That question lies at the heart of A Love Other Than Yours, a new Korean romance series starring Seo Kangjun and Ahn Eun-jin, premiering exclusively on Prime Video on 12 September.

The 14-episode drama follows Namgung Ho (Seo Kangjun) and Lee Mi-do (Ahn Eun-jin), longtime partners whose fiery romance has settled into a quiet, dependable bond. While Ho believes marriage is the natural next step in their relationship, Mi-do finds herself unexpectedly drawn to another man as she struggles through a difficult period in her career, forcing the couple to reconsider whether their years together are built on love, routine or simply familiarity.

Seo portrays Ho, a friendly assistant manager at Hunmin Snacks who is convinced that the relationship he has shared with Mi-do for 10 years can survive any challenge. His confidence, however, is put to the test when the woman he loves develops feelings for someone else.

Ahn stars as Mi-do, a once-promising film director whose career has stalled. During her lowest point, she crosses paths with a man she initially dismisses but gradually finds herself falling for, leaving her torn between a long-standing commitment and emotions she never expected.

Joining the lead stars are Lee Joo Ahn as Han Tae-seung, an ambitious attorney who begins questioning the life he has built after meeting Mi-do, and Jo Aram as Park Su-a, Ho’s reserved co-worker who has learned to keep her emotions guarded.

Directed by Hwang Seung-ki (The Matchmakers, Into the Ring) and Lee Garam, the series is penned by Yoo Su-ji, known for Somehow 18.