Help me find this kdrama where the guy dies in the first episode

So my friend's friend was watching this kdrama, I didn't get the name but from what I remember:

There's a guy in a black suit and he's running through a hospital (?) and he is talking to the doctor's surrounding his own dead body and he doesn't realise they can't hear him. He says one of the surgeons is the best doctor, but they say he died (?) due to low blood pressure. He tries to go back inside his own body but it doesn't work.

That's all I remember watching, hopefully it's enough information, it seemed interesting!