Good afternoon, everyone.

I'm zZoey.

I am going to introduce thea person who has had an important impact on my life to you.He is: my boyfriend.

“He is my boyfriend” is grammatical but it’s odd to use “he” if we don’t yet know to whom it refers.

In my mind, he is loyal, cheerful and generous. However he also has some disadvantages,hnegative traits. He is arrogant and his temper is really bad, which always makes me frustrated.

“Disadvantages” is used to refer to something that is being considered.

“Which” is attached to “his temper is really bad” so “makes” should be in the singular. If you meant to refer to both his arrogance and temper, you should instead write “and these things always frustrate me.”

It was late summer of 2017, the second semester of my first year in secondary school grade one. When I first saw him, he didn't leave a good impression on me. By accident,chance, we became deskmates and we got to know well.each other. In the process of getting along with him, we cry,ied, sweat, complained and even quearreled, ,but the joy of being with him through thick and thin makes me forget all the pains and troubles I have gone through.

“By accident” suggests an action, rather than a state.

“Grade 1” suggests the first year of primary school, that is, the grade with students who are generally between 5-7. “Year 1” is more flexible and can be used in a secondary school context though.

“Through thick and thin” is used with “with” to describe a relationship, so “being thick and thin” does not make sense.

As an old proverb says that, the sweetest fruit is the one that has undergone the bitterest ordeal.Owing to Because of him, I learned how to care for others and how to love. Before I knew him, I didn't know how to correctly deal with themy relationships with others. I am still very grateful to him.