I want to find the anime I watched when I was a child, which was translated in Mongolian. I forget which country it is. It's about a horse, a dark horse.

Dark Horse More than ten years ago, the young Baiyinbaolige was sent to a distant relative's grandmother's house on the grassland because of his mother's death, and grew up with six-year-old Somia. Under grandma's training, Baiyinbaolige soon became a herdsman's child and got a black pony. Later, grandma proposed that Baiyinbaolige and Sonia were engaged, so on the eve of Baiyinbaolige's election to the veterinary class, they expressed their intention and agreed to get married after Baiyinbaolige came back. However, four years later, Bai Yin Baolige came back only to find that Sonia was pregnant with another young Sheila's child. Angry Bai Yin Baolige and Sheila had a big fight, and then left her grandmother and Sophia in pain ... Ten years later, Bai Yin Baolige, who became a singer, returned to her hometown grassland to find her long-lost grandmother and Sophia, and her illegitimate daughter Qiqi received him and told him about her dark horse dream. Later, Baiyinbaolige was warmly received by Somia and her husband Dawacang, and Baiyinbaolige knew this story with mixed feelings in the night talk. Baiyinbaolige saw the figure of grandma from Sonia's busy, hardworking and happy figure, and he left with a new understanding of the past and life.