Lingering / Hotel Lake Ending Explained [SPOILER!]

SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk, or better, come back to this article later!

SPOILERS AHEAD

Lingering / Hotel Lake Plot Summary and Synopsis

Yoo-mi falls into unexpected mystery and horror while searching for her mother’s friend at a hotel to drop off her younger sister.

Source: Wikipedia (CC BY-SA 3.0).