The Fourth Princess led Ji Fengyan into Liu Ruse's room and Yichen was also brought there as a "hostage".
Liu Ruse turned 15-year-old that year and was slightly older than the Fourth Princess, or the same as Ji Fengyan. She became acquainted with the Fourth Princess on an occasion when she young and was well-liked by the Fourth Princess, hence she was recruited to keep the princess company. As Liu Ruse did not stay in the capital city, she lived with the Fourth Princess most of the time, except that after she was severely ill, the Emperor was afraid that she would pass the illness to Fourth Princess and moved her to a residence in the capital city.
The residence was not huge, but it looked very comfortable. The Fourth Princess was worried about Liu Ruse and arranged many servants and guards to guard the place.