It is possible the name refers to one of the following similar concepts or apps:
: An Android tool often used to create a "second" instance of an app (like having two WhatsApp accounts), which might be what you're looking for if "happiness" was a specific app name you wanted to duplicate. Download Second happiness apk
There is no widely recognized app called "Second Happiness" currently available for download as an APK. It is possible the name refers to one
: A popular habit-tracking and mindfulness app that offers daily tips, journal prompts, and spin-the-wheel challenges to improve well-being. If you are looking for a specific feature
If you are looking for a specific feature from an app you saw recently, could you provide about what the app does (e.g., is it a game, a tracker, or a photo editor)? Discover the 10 Second Happiness Hack