Longevity starts with inheriting a friend's legacy

After traveling to another world, Fang Xu awakened the [Friends' Inheritance System]. As long as someone in his friends list dies, he can randomly obtain a portion of their inheritance.

[Your friend Wang Ergou has passed away. As a friend, you can randomly inherit any of Wang Ergou's three estates! ]

[Congratulations on receiving the second inheritance: (Wang Ergou’s lovely wife, Ms. Wang)]

[Your friend Liang San has died. As a friend, you can randomly inherit any of Liang San’s two estates.]

[Congratulations on obtaining Heritage 10 (Strength attribute [-] points)]

……

Relying on the system, Fang Xu continued to make friends, waiting to inherit their legacy and practice to improve himself.

But as the "friends" in the list died one after another, Fang Xu gradually discovered that these people who became his friends seemed to have a short life...

Fang Xu was confused. In addition to the obvious system, did he also have a hidden buff that could "kill friends"?