Hello Ellie!
Thank you for doing this homework right away.
A paragraph is like story telling. You could also write it this way:
¡¡
Last year, on my brother's birthday, I was not able to clean my room. This is because, I got frightened on the movie "Zombie to Busan".
Please take note of the tense of the verb(past, present and future). And also, refrain from using Korean characters. Try to translate it in English, because I know you are very capable of it.
Have a happy long weekend Ellie!
-Teacher Jovy