The best gift I've ever received was a cell phone case and a mirror that the design is one of my favorite characters, Kakao Friends.= The best gift I've ever received were a cell phone case and a mirror that the design is one of my favorite characters, Kakao Friends.
It was my birthday gift and it was from my first big sister= They were my birthday gift and they were from my first big sister.
The reason why I chose this as the best is because it was my first birthday gift from my family= The reason why I chose them as the best is because they were my first birthday gift from my family.
We don't really give birthday presents to each other, we just go out and eat and watch a movie or something (period)
Or sometimes we give each other money, not gift (period)
So when I received the present, I was really happy (period)
And i=I loved the presents, I love cell phone cases and i=I needed a mirror that time.

***Put period at the end of your sentences and Capitalized 'I".