Hello! I am a postdoctoral research fellow of Korea Institute for Advanced Study (a.k.a. KIAS), Seoul, Korea.
Before going back to Korea, I was a visiting assistant professor (a.k.a. postdoc) of Department of Mathematics, University of California, Irvine (UCI), CA, USA. I was a member of the UC Irvine number theory group. Before moving to California, I was a graduate student of Department of Mathematics and Statistics, Boston University (BU), MA, USA, and I earned my Ph.D. degree under supervision of Rob Pollack.
I am an Iwasawa theorist. I am also broadly interested in algebraic number theory and arithmetic geometry; especially, I am interested in the theme of padic variation of Lfunctions, modular forms, and Galois representations via Hida families and eigenvarieties. I am also interested in the refined nature of Iwasawa main conjectures. (What can we see more than the main conjecture in Iwasawa theory?)
Before moving to US, I spent my undergraduate years at Seoul National University (SNU), Seoul, Korea.
Here is my coordinate:

@ KIAS, Seoul (January 8, 2013)

Curriculum Vitae / Research / Schedule / Teaching
For letters of recommendation, I follow Rob Pollack's rule.
South Korean Sewol ferry tragedy is a warning.
Finding references
MathSCInet /
via BU /
via UCI
the EUropean Digital Mathematics Library
arXiv.NT / arXiv.AG
Some websites related to number theory
Number Theory Web
UCI Number Theory Seminar
BU Number Theory Seminar (BUNT?)
Harvard Seminars
MIT / BCMIT / STAGE
KIAS Number Theory Seminar
Conferences in Arithmetic Geometry (thanks to Kiran Kedlaya)
SAGE / SAGE Questions
Drawing Fundamental Domains (using JAVA)
MazurTate's course on algebraic number theory at Harvard (Fall 2008)
Ravi Vakil's lecture note on algebraic geometry (postHartshorne?)
Johan de Jong's stacks project (postEGA?)
Some Video Lectures
Potential Modularity, 30 October 2009 at INI, UK
NonAbelian Fundamental Groups in Arithmetic Geometry at INI, UK
Algebraic Lie Theory at INI, UK
The stable trace formula, automorphic forms, and Galois representations  Summer School, Banff
The stable trace formula, automorphic forms, and Galois representations  Workshop, Banff
École d'été sur la conjecture de Birch et SwinnertonDyer
Ted Chinburg's Class Field Theory : 620, 621, 720, 721
Dick Gross's course on undergrad algebra
Miscellaneous Stuff
Math Overflow
LaTeX Questions
PhD Comics / xkcd
TED
"I Love You!" in Different Languages
Proofs of the Quadratic Reciprocity Law  more than 200!
Mathematics Genealogy Project
Some stuff for math nerd

Some Conferences and Workshops I've attended (and will attend)
I have almost complete scanned notes of the below events. If you are interested in those notes, shoot me an email.
New Directions in Iwasawa Theory, June 26 July 1, 2016, Banff, Alberta, Canada
Lfunctions and Arithmetic (A conference celebrating Karl Rubin's 60th birthday), June 1316, 2016, Harvard University, USA
Arithmetic of Euler systems, Aug 2230, 2015, Centro de Ciencias de Benasque Pedro Pascual, Spain
Pan Asian Number Theory 2015, July 20July 24, Sanya, China
Iwasawa 2015 (Official webpage), July 1317, 2015, King's College, London, UK
Iwasawa 2015 (Practical webpage), July 1317, 2015, King's College, London, UK
padic methods in number theory, May 2630, 2015, Berkeley
Southern California Number Theory Day 2015, May 23, 2015, 2015, UCSD
Southern California Number Theory Day 2015, April 18, 2015, 2015, Caltech
Elliptic Curves, Modular Forms and Iwasawa Theory (in honour of the 70th birthday of John Coates, March 2527, 2015, Cambridge
padic methods in the theory of classical automorphic forms, March 914, 2015, CRM, Montreal
Southern California Number Theory Day, October 18, 2014, UC Irvine, USA
Automorphic Forms and Arithmetic (ICM satelite conference), August 25–28, 2014, Postech, Korea
ICM 2014, August 13–21, 2014, Seoul, Korea
Pan Asian Number Theory 2014 (ICM satelite conference), August 5–9, 2014, Postech, Korea
ALGANT Summer School on Monodromy, June 23–28, 2014, Dobbiaco, Italy
padic Variation in Number Theory (in honor of Glenn Stevens’ 60th Birthday), June 2–6, 2014, BU, USA
Southern California Number Theory Day, March 8, 2014, Caltech, USA
Perfectoid Spaces and their Applications, February 17 – 21, 2014, MSRI, USA
Conference on Stark’s conjectures and related topics (in honor of H. Stark’s retirement), September 20–22, 2013, UCSD, San Diego, USA
Intensive Workshop on Fermat's Last Theorem, August 711, 2013
I gave 8 hour lecture series on Galois deformation.
2013 POSTECH Summer School in Number Theory, July 511, 2013
Arizona Winter School 2013: Modular forms and modular curves, March 913, 2013
The Workshop on Modular Forms and Galois Representations, January 78, 2013
The Sardinian Summer School in Iwasawa Theory, August 612, 2012
Iwasawa 2012, July 23  August 3, 2012
ILJU Postech Summer School 2012: Recent developments in Automorphic forms and Number theory, July 26, 2012
Towards a Local Proof of the Local Langlands Correspondence, May 1213, 2012
Workshop on the padic Langlands program: recent developments and applications, April 2327, 2012
Galois Representations, Shimura Varieties, and Automorphic Forms; A Workshop for Graduate Students and Postdoctoral Fellows, March 1216, 2012
Postech Winter School 2012: The Birch and SwinnertonDyer conjecture, January 614, 2012
KIAS Intensive Lecture Series on Rigid Geometry and the Local Langlands Correspondence, January 25, 2012
Workshop on Iwasawa Theory, October 1516, 2011
The BostonKeio Summer Workshop, September 1519, 2011
Computation with Modular Forms 2011 (Summer School), August 29September 3, 2011
Arizona Winter School 2011: StarkHeegner points, March 12  16, 2011
Postech Winter School 2011: Serre's modularity conjecture, January 14  21, 2011
Sage Days 22: Elliptic Curves (wiki), June 21  July 02, 2010 I worked in Chris Wuthrich's group and I implemented the twist of padic Lfunctions of (ordinary) elliptic curves by the Teichmuller character.
Modular/Geometric Iwasawa Theory and padic Lfunctions, June 14  20, 2010
Sage Days 18: Computations related to the BSD Conjecture, December 1  5, 2009
IAS/PCMI Summer School on Arithmetic of Lfunctions, June 28  July 18, 2009
Workshop on Recent Progressions on R=T, March 17  21, 2008
Asian Conference on Arithmetic Geometry, 2007, September 1518, 2007
