If the stock rises above $$102$:

The call buyer will exercise the option $$ they$$ll buy the stock from you at $$102.$

You must sell your stock at $$102,$ even if it$$s worth more $($say $$110).$

You miss out on gains beyond $$102,$ but:

You still gain $$2$ per share from the stock $($$$102-$ $$100)$

And you keep the premium from selling the call

So the loss on the call $($you have to sell the stock below market value$)$ is offset by your gains on the stock.