Becoming My Arch-Enemy's Little Darling

Summary 1: Rong Jin, the CEO of the Rong Group and a rising star in the business world, finds herself in a car accident while abroad. Her soul ends up in the body of a five-year-old girl living with her arch-enemy, Su Qingqiu. Su Qingqiu, the CEO of the Su Group, is known for her ruthless and eccentric ways, always at odds with Rong Jin. However, she dotes on the little girl living in her home, treating her like her own daughter, her precious little darling. Once a powerful business mogul, Rong Jin now has to attend elementary school and face her enemy's cold and noble face every night, receiving a kiss on the forehead. Su Qingqiu: Did you have a good day, darling? Rong Jin: ... When I get back to my own body, I will definitely make you pay. Eventually, Rong Jin does return to her body. Later, the employees of the Rong Group are shocked to discover that their boss is pursuing Su Qingqiu. But weren't they arch-enemies?! Summary 2: Rong Jin loved Su Qingqiu for three years, deeply and painfully. Since Su Qingqiu seemed indifferent and heartless, Rong Jin decided to leave. By a twist of fate, they end up living under the same roof. Rong Jin then realizes that Su Qingqiu didn't lack love for her; she loved her too much to express it properly. She appears cold but is so soft inside... Rong Jin thinks, it's okay, she will teach Su Qingqiu how to love. They have a long future ahead to make up for the lost years.