Chen Ruiyun

A passenger of the first class nocturnal car.
He is an opium trafficker employed by a public agency that is in conflict with an agency in an Oriental country.
He is on board the Magic Arrow to smuggle Persian red opium, a high-quality opium.
When the train departs on time after confirming that Akutagawa is on board, it is safe to say that Chen's goal has been achieved.
He had no intention of succeeding in smuggling opium, and he was the one who tipped off the agency about the opium smuggling route being developed on the Trans-Europe Express. The bait was himself. The Agency will surely appoint Akutagawa to the position. However, he is retiring, not turning himself in, and has no intention of being arrested and detained.
For what it's worth, Chen is a softie. He is stingy with small change, but not with large sums of money. He has a childish side, with a fondness for dried potatoes. He always wears a smile as if he can see right through people's hearts, or in other words, like Akutagawa, he has no facial expression. He is reluctant to reveal his true feelings and acts in an almost dehumanizing manner. He carries a small spinning top as a good-luck charm.
He is divorced. He carries a Hino Komuro-style automatic pistol and is an expert sniper.