Duality or Spectrum?
Well first of all, no one can be kept in isolation in a happy place. That's impossible.
People can feel pain in so many different ways. Even if you live in a paradise, your pleasure can be thwarted. Especially if you're just lazing and loafing around doing nothing productive. You feel terrible for no reason. Suffering and pain is inevitable. You cannot be shielded from it.
True satisfactory happiness can only be achieved when one does suffer. But it's a positive kind of suffering. For example, someone slaving away at a creative project and then being overwhelmed with joy when they finally complete it.
Someone could pursue lowly hedonistic pleasure their entire life like drugs, sex, or avoiding hard work. But these people still end up suffering because they're constantly trying to fill up an empty void inside of themselves through instant gratification.