.. Love is a cake that comes in layers

This is a problem which I run into when I was designing a logo for my class ( well, I'm still a newbie when it comes to AI, I know). And after minutes of googling I found out the solution, it's quite simple.

• To merge two connected objects you could select both and use Window/Pathfinder: Add...
• If they are not connected and they are not in groups you could select both and Object/Compound Path/Make.

That's all. Hope this can help someone out there stuck in the same problem like me.