Sasaeng Sister [In big roles: Sunghoon, Lee Know, skz, Ateez, Jungkook]

Filina moves to Korea to live with her stepfamily. Soon she finds out that her stepsister is entangled in suspicious activities and her stepbrother is a member of a famous K-pop group. Filina's life gets even more complicated when she develops a crush on a fairly recently debuted idol who, despite danger, helps her reveal the dark secrets of her stepsister.

This is a story with depth, emotional complexity, and suspense. If you like psychological thrillers, and intense character-driven stories you will likely enjoy this story.

Marked mature because of the following:

TW: VIOLENCE, some scenes might be disturbing to sensitive audiences.
[Mentions or implications of panic attacks, ed, sa, self-harm, and suicide]

Author's note:
Although the story is heavily inspired by the real world and real people, all of my characters are works of fiction, and their actions are imagined and separate from any real people and their actions. Because this is fan fiction, I use real names of famous people and companies, but everything that happens in this story is purely fictional and no hate is intended to any real people or organizations. I do not dislike any idol whose name I've used in the story.

I'll publish this also in AO3, just in case. My username is the same.