For ep4, since Ping is terminally sick, he went to Switzerland as this country allows what they call "assisted suicide". It allows you to chose when you want to put an end to your life, especially when you are terminally ill. Instead of suffering until you die of your illness, you can chose to leave before it becomes too painful. I'm not an expert on the subject but you can look it up This explains why he went to switzerland and not somewhere else.
I'm not an expert on the subject but you can look it up
This explains why he went to switzerland and not somewhere else.