I am a Ph.D. student in CompSec Lab, Department of Electrical and Computer Engineering, Seoul National University. I am advised by Prof. Byoungyoung Lee.I am interested in security for AI and system security in general. In particular, my research focuses on AI agent security. I designed Prompt Flow Integrity and DualView, a system-level mitigation against prompt injection attacks in LLM agents. Also I discovered Agent Data Injection (ADI), a new class of attacks that exploits the misinterpretation of untrusted data as trusted data in AI agents.