Well, it's not straightforward. 'Foreigner' might have some elements of truth, but it could also be a creation that just gives the illusion of reality.
In fact, 'The Foreigner' is not based on a true story. It's a product of creative writing and designed to entertain through fictional characters and plotlines.
Perhaps there is a character who befriends the foreigner and helps them navigate the new place. This character could be a young person who is more open - minded and interested in different cultures. And there could also be antagonists, people who are not so accepting of the foreigner because of their differences.
I'm not sure specifically which 'foreigner true story' you are referring to. There could be many stories about foreigners that are true. It could be about a foreigner's experience in a new country, like facing cultural shocks, making new friends, or achieving success in a different land.
Yes, Di Renjie's story was written by the Dutch writer, Van Gulik. He wrote The Case of Di Gong of the Tang Dynasty, a mystery novel about Di Renjie, the prime minister of the Tang Dynasty. This novel was a great success after it was published in Europe, and it was hailed as the " Holmes of the East." It took Gulik 18 years to write this novel. He was obsessed with Chinese culture and detective novels. Therefore, the author of Di Renjie's story was a foreigner.
Identity is also likely a theme. The foreigner may struggle with their own identity in a new environment. They have to figure out who they are in relation to the new culture and the people around them.