- A construction of nonabelian simple \'etale fundamental group, KMS-DMV Joint Meeting, October 2018
- The minimal number of Frobenius elements of G_{K,S} whose conjugacy classes generate the whole group G_{K,S}, International Conference of Honam-Youngnam Mathematical Societies, June 2018
- Construction of unramified extensions of number fields with prescribed solvable Galois groups, Algebra Seminar in Technion, May 2017
- The minimal number of Frobenius elements of G_{K,S} whose conjugacy classes generate the whole group G_{K,S}, The 6th Number Theory Festival 2017, Feb 2017
- Construction of unramified extensions of number fields with prescribed solvable Galois groups, Hokuriku Number Theory Workshop 2016, Dec 2016
- Lower bounds for discriminants of polynomials, The 5th Meeting of Young Number Theorists, Dec 2016
- The minimal number of Frobenius elements of G_{K,S} whose conjugacy classes generate the whole group G_{K,S}, The special session on Number theory of 2016 KMS conference, Oct 2016,
- Embedding problems and some related topics, PMI Number Theory Lecture Series, Aug 2016
- Remarks on quadratic fields with noncyclic ideal class group, Aichi number theory seminar, Mar 2016
- Remarks on quadratic fields with noncyclic ideal class group, New progress on number theory in Korea and China, Jan 2016
- Construction of unramified extensions with a prescribed solvable Galois group, Number Theory Seminar in UC Berkeley, Nov 2015
- Construction of unramified extensions with a prescribed solvable Galois group, 5th East Asia Number Theory Conference, Aug 2015
- Remarks on quadratic fields with noncyclic ideal class group, Sino-Korea International Conference, May 2015
- Remarks on quadratic fields with noncyclic ideal class group, KAIST ASARC Number Theory Seminar, Apr 2015
- Construction of unramified extensions with a prescribed solvable Galois group, Seoul National University, Apr 2015
- Construction of unramified extensions with a prescribed solvable Galois group, 4th Number Theory Festival, Feb 2015
- Construction of nonabelian simple \'etale fundamental group, KAIST ASARC Number Theory Seminar, Nov 2014
- Construction of unramified extensions with a prescribed Galois group., Meeting of Young Number Theorists, Jul 2014
- A construction of nonabelian simple \'etale fundamental group, KIAS Number Theory Seminar, Feb 2014
- Construction of unramified extensions with a prescribed Galois group, KIAS Number Theory Seminar, Oct 2013