Why Did the Young Lady Turn Evil After Returning Home?

(Multiple love interests + slightly yandere)

Lin Yingsi is a hardcore shut-in. After coming into a huge sum of money, he decides to coast through life and do nothing.

He never expected the heiress, who had gone abroad for treatment, to return and completely change the course of his life.

(The blurb is short and not very compelling. We recommend jumping straight into the story.)