Born a princess and raised a soldier, Pyeong Gang (Kim So Hyun) is a woman with big dreams and limitless ambition. Determined to become the first Empress of Goguryeo, Pyeong Gang will stop at nothing to make her dream come true. Clever and level headed, Pyeong Gang is well aware of the obstacles that stand in her way and she’s more than capable of taking them on. With meticulous planning, she sets out to make her dream come true. But things take an unexpected turn, the day she meets On Dal (Ji Soo).   A peace-loving man, whose only goal in life is to live in harmony with those around him, On Dal is the exact opposite of the ambitious princess. A peaceful calm amidst the turbulent storms of Pyeong Gang’s life, the warrior princess soon finds herself falling for gentle On Dal. Equally in love with the princess whose heart he now possesses, On Dal finds himself forsaking his principles in order to keep her safe. An endeavor that proves increasingly difficult, as players from all sides converge in a lethal battle for the throne. Forced to match both wits and strength against some of the most powerful men and women in Goguryeo, Pyeong Gang’s vie for power could very well cost her everything. Does she have what it takes to make her dreams come true or will the price she realizes she must pay prove to be too much? Based on the novel “Princess Pyeonggang” by Choi Sagyu, “River Where the Moon Rises” is a 2021 historical romance drama directed by Yoon Sang Ho.