Co-organizing the Number Theory Seminar at KAIST, since 2016.

Scientific committee, Pan Asia Number Theory, since 2025.3.

scientific coordinator of the network, French-Korean International Research Network (IRN) in Mathematics, since 2024.

Co-organizing the webinar in Number Theory, French-Korean IRL in Mathematics, since March 2021.

Program committee: the annual Number Theory Workshop 2024-2025.

A chairperson of the organizing committee (Korean side),  the 5th Korea-France conference in Mathematics, July 15-18, 2025, Bordeaux, France.

The 2nd World Congress of Korean Scientists & Engineers (제2회 세계한인과학기술인대회, 기초1 분과위원회 위원), July 9-11, 2024, Korea.

Co-organizing the 4th Korea-France Conference in Mathematics, August 21-25, 2023, KIAS, Korea.

The 1st World Congress of Korean Scientists & Engineers (제1회 세계한인과학기술인대회, 기초1 분과위원회 위원), July 4-7, 2023, Korea.

a chair of the plenary talk session, 2023 KWMS The 18th International Conference, June 26-27, 2023, KIAS, Korea.

a chair of the special session on Algebraic Number Theory, KMS Spring Conference, April 27-29, 2023, DCC, Korea.

Co-organizing the annual Number Theory Workshop 2023, KAIST(online), Jan. 27-28, 2023. 

a chair of the Plenary session and the special session on Automorphic forms and q-series, KMS, Oct. 18-21, 2022.

Co-organizing the 2nd 2022 Basic Sciences Academic Society Forum (제2차 기초과학 학회협의체 포럼), 과총회관, Seoul, August 11, 2022.

a program committee of ANTS XV (The 15th Algorithmic Number Theory Symposium) 2022, U. of Bristol, UK, Aug. 8-12, 2022.

Co-organizing Algebra 2022 and Beyond, Indiana University, Bloomington, USA, June 3-6, 2022.

Organizing the KAIX Distinguished Lectures in Mathematics, Distinguished Professor Michael Larsen (IU), May 13, 2022.

Organizing the KAIX Distinguished Lectures in Mathematics, Prof. Wen-Ching Winnie Li (PSU), Nov. 9, 2021.

a session Chair of the 9th East Asian Number Theory Conference, August 23-27, 2021.

Co-organizing the special session on Trends in number theory, KMS, Oct. 2020.

Co-organizing AMC-2020 Satellite workshop on arithmetic of automorphic forms and their function field analogues, Hanoi, 2020.

Organizing the 2nd Exchange of Young Ideas in Arithmetic (KAIST, UNIST, Korea Univ.), KAIST, Jan. 30-31, 2020.

Co-organizing the special session on Trends in number theory, KMS, Oct. 2019.

Co-organizing the 8th East Asian Number Theory Workshop, KAIST, Aug. 2019.

Co-organizing the special session on Trends in number theory, KMS, Apr. 2019.

Co-organizing The annual Number theory workshop 2019, KIAS, Feb. 2019.

Co-organizing the special session on Advances of automorphic forms and related topics, KMS-DMV Joint Conference, COEX, Korea, Oct.4-6, 2018.

Co-organizing the Satellite Conference on Automorphic forms and related topics, Seoul National University, Oct.3, 2018.

Co-organizing the special session on Number Theory, International Conference of the 70th anniversary of KMS, Seoul National University, Oct. 20-23, 2016.

Organizing the special session on L-functions and its related topics, KMS Spring Conference, Sungkyunkwan University, April 22-24, 2016.

a program committee of ANTS XI (The Algorithmic Number Theory Symposium) 2014,  (2013.01.-2014.09).

Co-organizing  ICWM 2014 (2013.01.-2014.09).

Participant, Galois representation, Genova, Italy, July 14-20, 2019.

Participant, Arithmetic in function fields, June 26-30, 2017.

Participant/Co-speaker, Covers in characteristic p, WIN(Women in Numbers), BIRS, Banff, Canada, Nov. 2-7, 2008.

Participant, International Workshop on Cryptography, Ewha Womans University, Jan. 28-29, 2008.

Participant, East Asia Number theory Conference, KAIST, Jan.21-24, 2008.

Participant, Arizona Winter School 2003: Logic and Number Theory, Univ. of Arizona, Tucson, March 15-19, 2003

Participant, Arizona Winter School 2001: Modular Forms, Univ. of Arizona, Tucson, March 10 - 14, 2001