After the birth of her younger brother Yaozu, the girl Zhaodi originally wanted to train him to be a sharp weapon against her parents. However, as they got along day and night, she was warmed by the sincerity and protection of this pure little boy. Yaozu protected his sister since he was a child, fighting for her to study. The two siblings supported each other, broke free from the shackles of the mountains, and grew up against the odds. In the end, Zhaodi became a young scientist, and Yaozu was guarding her side in military uniform. The siblings who were once trapped in darkness finally emerged from the top and faced the sun, completing each other's redemption.
