Do I need to download an app to watch Fate of the Three Realms: The Lady, the Prince, and the Demon?

No. It plays in any mobile or desktop browser, so there is nothing to install.

Fate of the Three Realms: The Lady, the Prince, and the Demon — Watch Free (82 Eps)

Name: Fate of the Three Realms: The Lady, the Prince, and the Demon
Genre: Miraculous Encounter, Plot Twist, Fantasy

Where can I watch Fate of the Three Realms: The Lady, the Prince, and the Demon online for free?: All 82 episodes are free on dramatap and play straight in your browser — no app download and no account needed.
How many episodes does Fate of the Three Realms: The Lady, the Prince, and the Demon have?: 82 episodes in total.
Which app is Fate of the Three Realms: The Lady, the Prince, and the Demon originally from?: It was originally released on NetShort.
Do I need to download an app to watch Fate of the Three Realms: The Lady, the Prince, and the Demon?: No. It plays in any mobile or desktop browser, so there is nothing to install.