Ghaziabad, Feb. 5 -- In the hours after three half-sisters jumped to their deaths from the ninth floor of their apartment in Ghaziabad, investigators began piecing together a portrait of a family that lived together but rarely connected - and of three girls who, police said, had slowly withdrawn not only from the world outside but even from their own family.

An eight-page suicide note recovered from the apartment has revealed that the girls did not "like" their half-brother or other family members, investigators aware of the case details said, because they felt no one around them understood their deep fascination with Korean culture.

Investigators said the sisters were so immersed in K-dramas and K-pop. They had abandoned their given na...