ChatInject: Abusing Chat Templates for Prompt Injection in LLM Agents
Hwan Chang^*, Yonghyun Jun^*, Hwanhee Lee^†
ICLR 2026
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Doc-PP: Document Policy Preservation Benchmark for Large Vision-Language Models
Haeun Jang^*, Hwan Chang^*, Hwanhee Lee^†
ACL 2026 Findings
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EXAONE 4.5 Technical Report
LG AI Research
Technical Report, 2026
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K-EXAONE Technical Report
LG AI Research
Technical Report, 2026
PDF| Abstract| Model

Keep Security! Benchmarking Security Policy Preservation in Large Language Model Contexts Against Indirect Attacks in Question Answering
Hwan Chang^*, Yumin Kim^*, Yonghyun Jun, Hwanhee Lee^†
EMNLP 2025
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How Do Large Vision-Language Models See Text in Image? Unveiling the Distinctive Role of OCR Heads
Ingeol Baek, Hwan Chang, Sunghyun Ryu, Hwanhee Lee^†
EMNLP 2025 (Oral)
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Which Retain Set Matters for LLM Unlearning? A Case Study on Entity Unlearning
Hwan Chang, Hwanhee Lee^†
ACL 2025 Findings
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Probing-RAG: Self-Probing to Guide Language Models in Selective Document Retrieval
Ingeol Baek, Hwan Chang, Byeongjeong Kim, Jimin Lee, Hwanhee Lee^†
NAACL 2025 Findings
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Hallucinate at the Last in Long Response Generation: A Case Study on Long Document Summarization
Joonho Yang, Seunghyun Yoon, Hwan Chang, Byeongjeong Kim, Hwanhee Lee^†
arXiv, 2025
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Leveraging Fine-grained Error Correction in Korean Speech Recognition for Consultation Services
Yonghyun Jun, Jimin Lee, Hwan Chang, Dongho Shin, Seolah Kim, Hwanhee Lee^†
2025