Mun Ka-young, Koo Kyo-hwan's Once We Were Us Trailer Captures Pain Of Love Slipping Away

The new trailer for Once We Were Us, the Korean remake of the acclaimed 2018 Chinese film Us and Them, has captured attention with its emotional storyline and powerful performances by the lead actors. Starring Mun Ka-young as Jung Won and Koo Kyo-hwan as Eun Ho, the film follows two people who once shared a deep connection but drifted apart.

The trailer vividly portrays their journey, revealing how their breakup shaped their lives and how fate reunites them after a decade apart.

Mun Ka-young And Koo Kyo-hwan Star As Former Lovers

The trailer opens with Eun Ho desperately chasing after Jung Won before her train departs. He reflects on how he once criticised movie couples for realising their mistakes too late, only to realise he had made the same

error. The story then flashes back to their younger days, showing Eun Ho promising to take care of Jung Won, while she dreams of a simple life together. Their joyful moments gradually give way to misunderstandings, culminating in a painful breakup.

The Once We Were Us trailer also features scenes of both characters grappling with their emotions after parting ways. It concludes with a powerful moment where they unexpectedly reunite years later, exchanging the poignant words, “Long time no see.”

What Fans Think Of Once We Were Us Storyline

While many viewers are already moved by the story of Once We Were Us and eagerly anticipating its release, some have expressed concerns about the age gap between the lead actors. Mun Ka-young is 29 years old, while her co-star Koo Kyo-hwan is 42, sparking discussions among fans following the trailer’s debut. Despite the debate, both actors have delivered powerful performances, and many fans feel their on-screen chemistry is convincing and compelling.

In the new film, Koo Kyo-hwan takes on the role originally played by Jing Boran in Us and Them, while Mun Ka-young portrays the character first brought to life by Zhou Dongyu. Directed by Kim Do Young, the South Korean remake is set to release in theatres on December 31, 2025.