explain movie arrival

Yolanda's operational error during surgery left a patient paralyzed and triggered a heart attack in herself out of shock.Desperate,Yolanda's mother pleaded with Carolyn to take the blame and serve the prison sentence in Yolanda's place. Deeply in love with Yolanda's brother, Frazier, Carolyn agreed to the request but kept everything secret, intending to explain the truth to him after her release. However, while in prison, Carolyn was diagnosed with cancer. Thus, she chose to conceal the truth indefinitely rather than cause Frazier further pain. Then, she secretly dedicated her final days to supporting him—helping his company develop an anti-cancer drug, and even donating her heart to his sister after her death. But Frazier knew nothing about it and still had a misunderstanding of her even after her death. At last, overcome with regret, he chose to die.

Dong Jian was a beggar who lost her parents while fleeing from a flood. She was nearly beaten to death after accidentally touching the sleeve of Ruyan Wei, the daughter of the Chancellor. She met Prince Zhao, who had been framed by Prince Shen and Chancellor Wei and became a sex slave with broken legs. He saved her life by giving her a pancake, and in return, she became his loyal guard dog. On the day Zhao ascended to the throne, they killed countless people, and the hall was filled with blood. But Zhao committed suicide in Dong's arms. Devastated, Dong killed herself too, but instead of staying dead, she traveled back to a time when Zhao was still a prince with healthy legs. In this life, Dong rose from being a beggar to become Prince Zhao's maid, eliminating his enemies in advance. Dong uncovered the Chancellor's collusion with Prince Shen. To protect himself, Prince Shen abandoned the Chancellor. When Dong thought everything was on the right track, the unexpected arrival of Leon, a holy monk, saw through that she was a time-traveler. Dong had hoped to see her savior, Zhao, live a peaceful life and ascend to the throne, which would be enough for her. But she didn't realize that she had already become Zhao's redemption and the love of his life.