My sickly little sister is too clingy, I just keep sticking to her.

[Single female lead + slice-of-life + healing + single female lead + no blood relation]
On this day, Chen Xia, who rose to fame with her novels featuring younger sisters, received a daunting task: her cousin, Chen Xue, had fallen ill with depression due to the pressure of her senior year of high school.
Just when the whole family was at their wits' end.
With a wave of his hand, Dad handed the child over to Chen Xia to take care of, saying that her symptoms were the same as when she was in her senior year of high school, and all she had to do was take care of her to eat, drink, and have fun.
I'll reimburse you for whatever it costs.
Chen Xia lived up to expectations. He was very pleased to see her improve step by step. However, there was one strange thing: she was becoming more and more clingy and always wanted to be close to him. He didn't know why.