Do I need to download an app to watch I See Your True Name, I Decide Your Fate (English-dubbed)?

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

I See Your True Name, I Decide Your Fate (English-dubbed) — Watch Free (57 Eps)

Where can I watch I See Your True Name, I Decide Your Fate (English-dubbed) online for free?: All 57 episodes are free on dramatap and play straight in your browser — no app download and no account needed.
How many episodes does I See Your True Name, I Decide Your Fate (English-dubbed) have?: 57 episodes in total.
Which app is I See Your True Name, I Decide Your Fate (English-dubbed) originally from?: It was originally released on ReelShort.
Do I need to download an app to watch I See Your True Name, I Decide Your Fate (English-dubbed)?: No. It plays in any mobile or desktop browser, so there is nothing to install.