After he was bought, Fang Yuan managed to obtain the identity of the couple from the information he gathered along the way.
The green-robed official's surname was Xu and his name was Ren. He was a scholar of the Qinghe District and was a child prodigy. At the age of 12, he was chosen for and passed the imperial examinations to become an official. After being selected to become an official, he took a few servants with him and took up the position. The lady, Wan'er, was his wife and was 5 months pregnant.
The rides in the carriages of the ancient times were bumpy and were not suitable for a pregnant lady. Furthermore, the drainage system of this realm was developed. As such, Xu Ren chose to take the boat.
At the quay, he rented a small boat and travelled downstream in it.
As for Fang Yuan and the other 2 fishes, they were naturally brought to the kitchen.