Consider these expression

>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 is there any difference between come in/come to in this context? Because of native language, I tend to use come in rather than come to.