Consider these expressions

> Come to my room.

> Come in my room.

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> When I came in the lobby/corridor in the evening, there were tons of people gathered around for X.


> When I came to the lobby/corridor in the evening, there were tons of people gathered around for X.

Can anyone explain to me whether there is any difference between _come in_ / _come to_ in this context? Because of my native language, I tend to use _come in_ rather than _come to_.