MTL - Evolved From Polluting the World - Chapter 5 Reflex arc 1 km long

"In her previous life, she is used by her first love to send her own company into the tiger's den. She becomes bankrupt, gets kicked out of the house by her father, and becomes the target of ridicule by the family. Worst of all, she believes her best friend's lies, thinking that everything was done by her ‘husband’. Under her best friend's ploys, she almost kills him and is ultimately sentenced to prison, where she dies of depression.

When he was five years old, Xiao Yihan swaggered into Jiang Wei’s room, hugging his little quilt: “Jiang Xiaowei, there’s no one at my home. My dad doesn’t feel assured leaving me alone and told me to come over and sleep at your place.”Jiang Wei stared at him with her wet, round eyes: “If you sleep here, where will I sleep?”Xiao Yihan patted the spot next to him on the bed and said with a serious little adult-like expression: “Here. After all, I’m going to marry you sooner or later. Don’t worry, I’ll take responsibility!”Jiang Wei: “……”What kind of responsibility could a little kid who only plays in the mud take?A story with a bit of sweetness about a cold, aloof dance major girl versus a mischievous medical school heartthrob guy.

In her last life, she was miserable and ordinary. This time, she got into the fashion and was reborn in another world. She was still the same person… even with the same body and face. What was the point of reincarnation? A childhood companion? He always pulled her hair and made troubles for her? A handsome boy? The boy never looked at her and was 15 years older than her! A prestigious teacher? The teacher spent his days eating and drinking, coaxed, played tricks, and controlled others… Too scary and better run away? No no no, such a challenging life was bound to be wonderful! Now let me take you back to the 70s and live a fast life!

- Description from Novelupdates