This was from part 8 of aespa's party!. They all had past life regression via hypnosis.

Karina – women in Joseon dynasty. Did lots of cooking and raised kids. Liked to paint. Felt trapped.

Gisselle – born to family with cold parents that kicked her out at the age of 18. Was beautiful, worked at a bar and eventually became the managerr. Married, had a kid, and eventually died from a car hitting her. Her life appears to be from 1940 to 1990s.

Ningning – was born to a culture that lived in the forest and used whistling as a form of communication. She had long hair, didn't know her father, and he mother left her, she eventually jumped off a cliff and committed suicide from loneliness. Wanted to know the purpose of life and wanted love.

Doing some googling, I found

The Mazatec people, who use a whistled form of their language, traditionally live in the forested regions of Oaxaca, Mexico. Their communities are situated in mountainous and densely forested areas, where the whistled language is particularly useful for long-distance communication.

Winter – was a poet. Had 3 kids. Served as educator for crown prince Sado.

from google,

Crown Prince Sado (1735–1762), born Yi Seon, was a tragic figure in Korean history during the Joseon Dynasty. He was the second son of King Yeongjo. Despite being the designated heir to the throne, his life was marked by severe mental illness and erratic behavior, which led to numerous incidents of violence and murder within the royal court. Due to these issues, King Yeongjo ordered Sado's execution in a manner meant to avoid direct bloodshed, as dictated by Confucian principles. Sado was confined in a rice chest, where he died after eight days. His death has been a subject of historical debate and intrigue, reflecting the complexities of mental health, royal duty, and familial relationships within the Joseon Dynasty.

from one of the youtube comments, we have

It was really cool to hear the story of Winter being Crown Prince Sado's teacher
FYI Crown Prince Sado's teacher is Chae Je-Gong, he is a smart scholar from the Namin faction and he is really a poetry writer and has 3 children, But winter said her name was Chae Youngwoo. Chae Je-Gong has several pen names, I'm not sure if 'YoungWoo' is one of them