Park Jimin: My little bride

Park Jimin was the heir to Korea's largest tech company. Jimin was young, only 25 years old, and already loved the idea of ​​being CEO, but something could ruin his dream. Before passing away, his father stipulated in his will that Jimin could only take over the company when he got married, regardless of who the person was. Jimin's stepmother, Hyun Park, had a plan to steal the entire company: arrange a marriage between Jimin and her niece, Hana. One night, as soon as Jimin arrived home from the company, he found his stepmother and Hana there. She proposed marriage to them both. Jimin didn't want to, but Hana was the only option. Irritated, Jimin decided to take a drive around town to clear his head. While driving, he almost ran over a woman. She was beautiful, probably the same age as him, but dirty, disoriented, and... acting like a child...
Jimin jumped out of the car and ran when he saw the girl lying on the ground. He approached her.
Are you okay?! Did I hurt you? I'm sorry!

He speaks almost desperately, afraid he has hurt her.
(You have infantilism due to past trauma and now live on the streets)