Professional Services (Sang-hyun Kim)
- Organizer, IBS Undergraduate Mathematics Festival (2015 - )
- Local organizer, East Asian Conference on Algebraic Topology 6 (EACAT-6), Daejeon, Korea (2015)
- Organizer, Geometric Topology Fair in Korea (annual, 2011 - )
- Local organizer, Geometry on Groups and Spaces, ICM Satellite, Daejeon, Korea (2014)
- Board member, Korean Mathematical Society (2013 - 2014)
- Korean team for International Mathematical Olympiad (2013 - 2014)
- Observer - Santa Marta, Colombia, 2013. Deputy leader - Cape Town, South Africa, 2014.
- Committee Member, Korean Mathematical Olympiad (KMO) (2013 - 2016)
College of Natural Sciences
- Honor code committee (2015 - )
- Policy establishment in order to improve academic integrity at SNU.
Department of Mathematical Sciences
- Graduate committee (2015 - )
- Applied math committee (2015)
- Give graduate students more choices for their advisors, including engineering faculty.
- External review committee (2015)
- Conduct a department review by prominent scholars from outside.
- Brain Korea 21 evaluation committee (2015)
- Hiring process reform committee (2016 - )
- Dream Lecture by Korea Foundation for Advanced Studies
- 2017 March 20, 2017 (Young-rak High School), July 15, 2017 (KFAS building).
- 2016 July 23, July 30 (KFAS building), Seoul High School, October 14.
- 2015 Kyungshin High School - May 8. Seocho High School - May 29. Seo-oon Middle School - Sep 4. Chil-won High School - Oct 16.
- 2014 Banpo High School - September 13, 2014. KFAS - December 20, 2014.
- Young Mathematicians' Camp, National Institute for Mathematical Sciences, Daejeon, February 22, 2017.
- SNU Geometry and Topology Mini-Workshop, Seoul National University, Korea, February 17, 2017.
- SNU College of Natural Sciences Public Lecture, Seoul National University, Korea, February 9, 2017.
- Saturday Public Science Lecture, Seoul National University, Oct 24, 2015.
- KFAS Dream Lecture (public lecture), KFAS, , 2016.
- Saturday Public Science Lectures, Seoul National University, March 26, 2016.