I can’t remember the MC’s name, but the novel is a quick transmigration type. Female protagonist. I don’t remember a lot about it except for this specific arc. This arc is about a rich young mistress marries this poor man rom the mountains because she likes him. The ML didn’t like her. She had to go his hometown to get him to marry her. One time she gets bitten by multiple mosquitoes in the mountains. Then all I remember is sometime after they go back to her place. ML becomes an awesome business man. They fall in love I think. MC can’t stay for too long after her missions is completed but she decides to stay for her child. She ends up being ill. Her illness made her wake up less and less over time. On her last day in that plane, the ML brings her to his favourite spot up in the mountains. She dies in his arms. She leaves the plane and goes to another one. My memory isn’t good so this may be jumbled up with something else... Thank you for trying.