What are my chances of getting into Harvard as an undergraduate?

I am an international student from South Korea, currently attending an international school in South Korea.
I have 1550 on New SAT, 800 for Math 2, 800 for World History, and 790 for Literature.
Our school is an IB school, so I have gotten into a full IB-Diploma Program.
I have taken: English A HL, History HL, Korean A HL, Theatre HL, Chemistry SL, and Mathematics SL. On the IB exams, I have gotten all 7’s except for English, which I got a 6.
Speaking of extracurriculars, I have served as a member of Student Council for 4 years — Vice in my junior year, and President in my senior year for the Student Council Chair(meaning for the whole high school, not just a grade).
I have founded Make A Wish Club, in collaboration with Make A Wish Korea, and have made 20 wishes of children with severe illnesses as a club(examples of wishes were getting a macbook, meeting a K-pop star, etcetera. All money collected through fundraising).
I have participated in various drama productions, including musicals which I have always gotten lead roles, and I was nearly scouted by an actors agency with my performance. I am also a part of teen theatre group outside of school, which is a group of young international aspiring actors and actresses. Plus, I have participated in this project called dream theatre – we would visit an orphanage, and work on a play with the children there, and eventually perform in front of a large group of audience.
I have a great interest in writing. I have been in a publication class of my school since freshmen year, becoming the editor-in-chief in my junior year. I have also written in a magazine called Teen 10 Magazine(magazine for English speaking teenagers in Korea), and served as a Editor-in-chief since my sophomore year. For my personal project, I have written a 200 page novel, which was published in Korea, and have won a literature award in Korea in an international section(since it was written in English). I also have self-published a few short stories, which I received great reviews online, but with a pen name.
I have been in JV basketball team in my freshman year, and Varsity since sophomore year, and have become the captain in my senior year.
I have worked with Save the Children Korea for all 4 years in my high school, volunteering there during every school breaks. I was a translator – translating letters from the sponsored children into the Korean sponsors(English to Korean). I received an award from the head of Save the Children Korea recently.
Since my sophomore year, I have worked as a staff member in professional musical and play sets, and also worked as a tour guide for foreigners staying in this youth hostel, travelling with them all around Seoul.

I have written my essay, and received recommendation letters from my counselor, newspaper teacher, and history teacher.

I would like to pursue writing and acting as I move on.

How are my chances?

You do have a chance, but it is Harvard after all. You never know. Also, I’m not sure why you would want to go to Harvard if you want to pursue acting and writing. I think Northwestern, which is a top school for both writing and acting, would be a better fit for your interests. Also, it’s acceptance rate is a little bit higher than Harvard’s. Don’t want to go to Harvrad just because of its low acceptance rate and reputation; go to a school that you really love and fit into.

Do you need financial aid?

It’s Harvard. Plus you’re international. Plus you’re from SK. Plus there are kids from your country with national achievements/talents in addition to stellar academics. Good luck.