Do I need to download an app to watch After Rebirth, My Sister and I Switched Husbands?

No. It plays in any mobile or desktop browser. The VIP pass is bought through Telegram, but watching itself needs nothing installed.

Watch After Rebirth, My Sister and I Switched Husbands Free Online — All 31 Episodes

Where can I watch After Rebirth, My Sister and I Switched Husbands online for free?: The first 5 episodes are free on dramatap and play straight in your browser — no app download and no account needed. The remaining 26 episodes unlock with a VIP pass.
How many episodes does After Rebirth, My Sister and I Switched Husbands have?: 31 episodes in total.
Do I need to download an app to watch After Rebirth, My Sister and I Switched Husbands?: No. It plays in any mobile or desktop browser. The VIP pass is bought through Telegram, but watching itself needs nothing installed.