Why is mussen still investigating about Xia Ranran?

is Xia Ranran's death suspected or something?

no matter what, it makes Xia Hesheng fidgety.

will Mu Chen find out that she sent someone to chase Xia Ranran and drive him down the cliff?

but what if I know? She hated Xia Ranran originally. She didn't want Xia Ranran to live in this world. Mu Chen loved her so much. He must support her.

besides, when those things happened, Mu Chen was disgusted with Xia Ranran for a long time. How could he feel any sense of her death.

even if there is, it's too easy for Xia Ranran to die. It's...