River Where the Moon Rises Cast: Full Guide to the Main Actors and Characters

River Where the Moon Rises is a historical K-drama that blends romance, politics, and war against the backdrop of the Goguryeo kingdom. The series quickly gained attention for its compelling storytelling and strong performances, even amid behind-the-scenes casting changes. For viewers searching for the full River Where the Moon Rises cast, understanding who plays each major character adds more depth to the experience.

The drama revolves around Princess Pyeonggang, a determined royal raised as an assassin, and her relationship with On Dal, a peace-loving man who becomes a warrior. Alongside the leads, a talented supporting cast brings the complex world of Goguryeo to life. Each actor contributes to the emotional and political weight of the story, making the series engaging from start to finish.

Here is a complete breakdown of the main cast members and their roles in the drama.

Kim So-hyun as Princess Pyeonggang

Kim So-hyun as Princess Pyeonggang in a powerful scene from the historical drama. (Image via KBS)

Kim So-hyun plays the central role of Princess Pyeonggang, also known as Yeom Ga-jin. Her character is strong-willed, intelligent, and deeply committed to reclaiming her rightful place in the royal court. Raised away from the palace, she grows into a skilled fighter with a clear sense of purpose.

Kim So-hyun’s performance stands out for balancing emotional vulnerability with fierce determination. She effectively portrays a character torn between love and duty, which becomes a major theme throughout the series. Her presence anchors the drama and gives it emotional depth.

The role further cemented her reputation as one of the most versatile actresses in Korean television. Her portrayal ensures that Pyeonggang remains a memorable and powerful protagonist.

Na In-woo as On Dal

Na In-woo as On Dal during his transformation into a warrior in Goguryeo. (Image via KBS)

Na In-woo stars as On Dal, a kind-hearted man who initially avoids conflict but eventually embraces his destiny as a warrior. His character represents innocence and moral strength in contrast to the political chaos surrounding him.

Na In-woo joined the series after a major mid-production casting change, replacing the original actor. Despite the challenge, his performance was well-received for bringing sincerity and warmth to the role. His chemistry with Kim So-hyun plays a crucial role in the drama’s romantic storyline.

On Dal’s transformation from a peaceful villager to a courageous general is one of the series’ most compelling arcs. Na In-woo captures this evolution convincingly, making the character relatable and inspiring.

Supporting Cast Adds Depth to the Story

Lee Ji-hoon portrays Go Geon, a loyal general and close ally of Pyeonggang. His character is complex, often caught between duty and personal feelings. Lee Ji-hoon brings intensity and emotional nuance to the role, making Go Geon a standout supporting character.

Choi Yoo-hwa plays Hae Mo-yong, a mysterious and intelligent woman with her own ambitions. Her character adds intrigue to the political storyline, often operating in morally ambiguous ways. Choi Yoo-hwa’s performance enhances the show’s layered narrative.

Kang Ha-neul appears in the early episodes as On Dal’s father. His brief role leaves a strong impression and helps establish the emotional foundation of On Dal’s journey. These supporting performances collectively enrich the drama’s world.

One of the most talked-about aspects of the River Where the Moon Rises cast was the mid-series replacement of the male lead. Originally, On Dal was played by actor Ji Soo, but he was removed from the show following controversy.

The production made the unusual decision to reshoot several episodes with Na In-woo stepping into the role. This move was risky but ultimately helped stabilize the series. Viewers responded positively to Na In-woo’s portrayal, allowing the drama to maintain its momentum.

This casting change became a defining moment for the show, demonstrating the production team’s commitment to quality and continuity. It also brought additional attention to the series globally.