Cp1: Princess Pingcheng (Chu Changle) - Zhou Jia (character: Bai Yu) = love at first sight
CP2: Princess Rucheng (Chu Ruzhen) - Pu Qingzhao (word: Tanglan) = love for a long time
Cp3: Princess Jincheng (Chu Changan) - Chi Yunxuan (word: Anhua) = happy enemies
CP4: Princess Yicheng (Chu Lizhi) - Ye Yinqiu (word: Yiai) = fall in love and kill each other
Same-sex marriage is allowed, no abuse. There are so many CPs, and each pair has a different ending, both for men and women.
Companion volume: The Dayong Prince Consort's miscellaneous history "The Past of Prince Xun" records the story of Prince Chu Muli of Xun and his concubine Yelu Jinduo who was twelve years younger than her. If you are interested, you can take a look. The whole article is described from a third-person perspective.
Intention: Any similarity is purely coincidental.