Fascinating read.
The South Korean woman who adopted her best friend | Arts and Culture | Al Jazeera https://www.aljazeera.com/features/2023/12/2/the-south-korean-woman-who-adopted-her-best-friend
Coincidentally I came across this graphic novel about a similar situation, but with a Japanese gay couple: https://tokyopop.com/products/9781427873385_why-i-adopted-my-husband