My favorite song is Boy with Luv. It's Korean song. —> My favorite song is Boy with Luv. It's a Korean song.

=> Corrected : The sentences were corrected grammatically.​

B. Make these sentences into English.

"나 오후에 영화 보러 갈거야.같이 갈래?"

I will go to the movie star this evening. Will you go with me? ---> I'm going to the movies in the afternoon. Would you like to go with me?

=> This sentence is okay. This is another way of saying it. ​

"물론이야. 좋아.몇 시에 만날까?"

Of course. That's good. What time shall we meet? ---> Sure, I'd like to. What time can we meet? 

=> This sentence is okay. This is another way of saying it. ​

3시 어떠니?

Is it okay at 3 o'clock? ---> How about three o'clock?

=> This sentence is okay. This is another way of saying it. ​