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2 of 4 improved grammar

“Come to/come in” what is the difference?

Consider these expression

Come to my room.

Come in my room.


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.