Secret Room Of Glowing Tentacles

At Ellington Hotel, a forbidden room hides a mysterious creature—and owner Katherine's deepest secret. Daughter Iris, haunted by six boyfriends who vanished, infiltrates as a worker, deceived by Noah to steal a black notebook. Facing father William, she uncovers outsiders' plots, finally understands her mother's protection, and joins her in guarding the secret.

Reelife released it as 84 bite-size episodes mixing secret identity, made to watch on a phone in one sitting or a few.

The draw here is waiting for the truth about who the lead really is to come out.

The whole series takes roughly 2–3 hours, so it's an easy binge.

Press play on episode 1 and DramaNext moves on to the next one by itself. No account and nothing to install.