Publications

2026

• Privasis: Synthesizing the Largest 'Public' Private Dataset from Scratch
  Hyunwoo Kim*, Niloofar Mireshghallah*, Michael Duan, Rui Xin, Shuyue Stella Li, Jaehun Jung, David Acuna, Qi Pang, Hanshen Xiao, G. Edward Suh, Sewoong Oh, Yulia Tsvetkov, Pang Wei Koh, Yejin Choi
  arXiv Preprint 2026 

  paper webpage code tldr

• Golden Goose: A Simple Trick to Synthesize Unlimited RLVR Tasks from Unverifiable Internet Text
  Ximing Lu, David Acuna, Jaehun Jung, Jian Hu, Di Zhang, Shizhe Diao, Yunheng Zou, Shaokun Zhang, Brandon Cui, Mingjie Liu, Hyunwoo Kim, Prithviraj Ammanabrolu, Jan Kautz, Yi Dong, Yejin Choi
  arXiv Preprint 2026 

  paper data model tldr

• A False Sense of Privacy: Evaluating Textual Data Sanitization Beyond Surface-level Privacy Leakage
  Rui Xin*, Niloofar Mireshghallah*, Shuyue Stella Li, Michael Duan, Hyunwoo Kim, Yejin Choi, Yulia Tsvetkov, Sewoong Oh, Pang Wei Koh
  IEEE Conference on Secure and Trustworthy Machine Learning (SaTML) 2026 

  paper

• SimpleToM: Exposing the Gap between Explicit ToM Inference and Implicit ToM Application in LLMs
  Yuling Gu, Oyvind Tafjord, Hyunwoo Kim, Jared Moore, Ronan Le Bras, Peter Clark, Yejin Choi
  International Conference on Learning Representations (ICLR) 2026 

  paper blog post tldr

2025

• Socratic-MCTS: Test-Time Visual Reasoning by Asking the Right Questions
  {David Acuna*, Ximing Lu*, Jaehun Jung*, Hyunwoo Kim*}, Amlan Kar, Sanja Fidler, Yejin Choi
  Empirical Methods in Natural Language Processing (EMNLP) 2025 

  paper

• Long Grounded Thoughts: Distilling Compositional Visual Reasoning Chains at Scale
  {David Acuna*, Chao-Han Huck Yang*, Yuntian Deng*, Jaehun Jung*, Ximing Lu*}, Prithviraj Ammanabrolu, Hyunwoo Kim, Yuan-Hong Liao, Yejin Choi
  arXiv Preprint 2025 

  paper website

• HAICOSYSTEM: An Ecosystem for Sandboxing Safety Risks in Human-AI Interactions
  Xuhui Zhou, Hyunwoo Kim*, Faeze Brahman*, Liwei Jiang, Hao Zhu, Ximing Lu, Frank Xu, Bill Yuchen Lin, Yejin Choi, Niloofar Mireshghallah, Ronan Le Bras, Maarten Sap
  Conference on Language Modeling (COLM) 2025 

  paper webpage tldr

• Hypothesis-Driven Theory-of-Mind Reasoning for Large Language Models
  Hyunwoo Kim, Melanie Sclar, Tan Zhi-Xuan, Lance Ying, Sydney Levine, Yang Liu, Joshua B. Tenenbaum, Yejin Choi
  Conference on Language Modeling (COLM) 2025 

  paper code tldr

• Social World Models: Universal Structured Representation for Social Reasoning
  Xuhui Zhou, Jiarui Liu, Akhila Yerukola, Hyunwoo Kim, Maarten Sap
  arXiv Preprint 2025 

  paper

• Retro-Search: Exploring Untaken Paths for Deeper and Efficient Reasoning
  {Ximing Lu*, Seungju Han*, David Acuna*, Hyunwoo Kim*, Jaehun Jung*}, Shrimai Prabhumoye, Niklas Muennighoff, Mostofa Patwary, Mohammad Shoeybi, Bryan Catanzaro, Yejin Choi
  arXiv Preprint 2025 

  paper tldr

• Alpaca against Vicuna: Using LLMs to Uncover Memorization of LLMs
  {Aly M. Kassem*, Omar Mahmoud*, Niloofar Mireshghallah*}, Hyunwoo Kim, Yulia Tsvetkov, Yejin Choi, Sherif Saad, Santu Rana
  Nations of the Americas Chapter of the Association for Computational Linguistics (NAACL) 2025 

  paper code tldr

2024

• Perceptions to Beliefs: Exploring Precursory Inferences for Theory of Mind in Large Language Models
  Chani Jung, Dongkwan Kim, Jiho Jin, Jiseon Kim, Yeon Seonwoo, Yejin Choi, Alice Oh, Hyunwoo Kim
  Empirical Methods in Natural Language Processing (EMNLP) 2024 

  paper tldr

• Is this the real life? Is this just fantasy?
  The Misleading Success of Simulating Social Interactions With LLMs
  Xuhui Zhou, Zhe Su, Tiwalayo Eisape, Hyunwoo Kim, Maarten Sap
  Empirical Methods in Natural Language Processing (EMNLP) 2024 

  paper tldr

• Deal, or no deal (or who knows)? Forecasting Uncertainty in Conversations using LLMs
  Anthony Sicilia, Hyunwoo Kim, Khyathi Raghavi Chandu, Malihe Alikhani, Jack Hessel
  Findings of the Association for Computational Linguistics (Findings of ACL) 2024 

  paper

• Can LLMs Keep a Secret?
  Testing Privacy Implications of Language Models via Contextual Integrity Theory
  Hyunwoo Kim*, Niloofar Mireshghallah*, Xuhui Zhou, Yulia Tsvetkov, Maarten Sap, Reza Shokri, Yejin Choi
  International Conference on Learning Representations (ICLR) 2024  Spotlight

  paper code webpage tldr

2023

• FANToM: A Benchmark for Stress-testing Machine Theory of Mind in Interactions
  Hyunwoo Kim, Melanie Sclar, Xuhui Zhou, Ronan Le Bras, Gunhee Kim, Yejin Choi, Maarten Sap
  Empirical Methods in Natural Language Processing (EMNLP) 2023  Oral

  paper code webpage blog post tldr

• SODA: Million-scale Dialogue Distillation with Social Commonsense Contextualization
  Hyunwoo Kim, Jack Hessel, Liwei Jiang, Peter West, Ximing Lu, Youngjae Yu, Pei Zhou, Ronan Le Bras, Malihe Alikhani, Gunhee Kim, Maarten Sap, Yejin Choi
  Empirical Methods in Natural Language Processing (EMNLP) 2023  Oral Outstanding Paper Award

  paper code blog post tldr

2022

• ProsocialDialog: A Prosocial Backbone for Conversational Agents
  Hyunwoo Kim*, Youngjae Yu*, Liwei Jiang, Ximing Lu, Daniel Khashabi, Gunhee Kim, Yejin Choi, Maarten Sap
  Empirical Methods in Natural Language Processing (EMNLP) 2022 

  paper code tldr

2021

• KLUE: Korean Language Understanding Evaluation
  Sungjoon Park*, Jihyung Moon*, Sungdong Kim*, Won Ik Cho*, ..., Hyunwoo Kim, ..., Alice Oh*, Jung-Woo Ha*, Kyunghyun Cho (31 authors)*
  Neural Information Processing Systems (NeurIPS) Datasets and Benchmarks 2021 

  paper code webpage

• Perspective-taking and Pragmatics for Generating Empathetic Responses Focused on Emotion Causes
  Hyunwoo Kim, Byeongchang Kim, Gunhee Kim
  Empirical Methods in Natural Language Processing (EMNLP) 2021 

  paper code workshop

• How Robust are Fact Checking Systems on Colloquial Claims?
  Byeongchang Kim*, Hyunwoo Kim*, Seokhee Hong, Gunhee Kim
  Nations of the Americas Chapter of the Association for Computational Linguistics (NAACL) 2021 

  paper code workshop

2020

• Will I Sound Like Me?
  Improving Persona Consistency in Dialogues through Pragmatic Self-Consciousness
  Hyunwoo Kim, Byeongchang Kim, Gunhee Kim
  Empirical Methods in Natural Language Processing (EMNLP) 2020  Oral

  paper code workshop

2019

• Curiosity Bottleneck: Exploration by Distilling Task-Specific Novelty
  Youngjin Kim, Hyunwoo Kim*, Wontae Nam*, Jihoon Kim, Gunhee Kim
  International Conference on Machine Learning (ICML) 2019 

  paper code

• Abstractive Summarization of Reddit Posts with Multi-level Memory Networks
  Byeongchang Kim, Hyunwoo Kim, Gunhee Kim
  Nations of the Americas Chapter of the Association for Computational Linguistics (NAACL) 2019  Oral

  paper code