Do I need to download an app to watch My Bestie Wants My One-Night Stand CEO (English-dubbed)?

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

My Bestie Wants My One-Night Stand CEO (English-dubbed) — Watch Free (78 Eps)

Where can I watch My Bestie Wants My One-Night Stand CEO (English-dubbed) online for free?: All 78 episodes are free on dramatap and play straight in your browser — no app download and no account needed.
How many episodes does My Bestie Wants My One-Night Stand CEO (English-dubbed) have?: 78 episodes in total.
Which app is My Bestie Wants My One-Night Stand CEO (English-dubbed) originally from?: It was originally released on ReelShort.
Do I need to download an app to watch My Bestie Wants My One-Night Stand CEO (English-dubbed)?: No. It plays in any mobile or desktop browser, so there is nothing to install.