Fu Jia Yi Chan

The full story begins with a suicide note left by a mysterious woman. After getting off work, the beautician Wen Xiaohui received a suicide note from his "elder sister" who had already lost contact. The suicide note stated that he would receive a three million inheritance and that he needed to be the guardian of a 15-year-old.
The boy was named Luo Yi, the son of a mysterious big man. He was warm and lively when he first saw him, and he was extremely intelligent. He was called a genius boy. After Wen Xiaohui became Luo Yi's guardian, he slowly got along with him, opened his heart, regarded him as the most important relative, but gradually discovered another side of him. Darkness, dominance, and a special desire to control, Luo Yi's human nature is flawed, and he does not compromise to achieve his goals.
Wen Xiaohui tried to leave but found that he was firmly controlled by Luo Yi. In order to get a $300 million inheritance, Luo Yi forged a suicide note and hurt his family and friends.
The hateful person must be pitiful, and Wen Xiaohui is particularly frightened while feeling very distressed. In the huge scam, they all lost themselves...
(Source: Douban)
~~ Adapted from "Additional Inheritance" by Shui Qian Cheng.