About Us

A Trusted Security Expert, EastSun Security

Mission & Vision

What We Stand For

MISSION

Finding vulnerabilities before attackers do

Through real-world penetration testing and precise assessment, we proactively find and eliminate threats before our clients' systems are exposed to actual attacks.

VISION

A trusted information security partner

Built on technical expertise and field experience, we aim to be the information security partner every client — regardless of size — can trust with confidence.

Core Values

How We Work

01

Adversary-Minded

We approach every engagement the way a real attacker would — creative, persistent, and unwilling to stop at the first finding.

02

Evidence Over Assumption

Every finding is verified and reproducible. We report what we can prove, prioritized by real-world impact, not checklist volume.

03

Compliance With Substance

We treat certifications like ISMS-P as a floor, not a ceiling — the goal is a security posture that holds up long after the audit ends.

History

History

Dec 2017

EastSun Security founded

Started in Nowon-gu, Seoul as a penetration testing and security consulting firm.

Present

Security consulting and internet security assessment operations

Building expertise through numerous projects centered on penetration testing, security consulting, and internet security assessment.

Expertise

Organization & Expertise

Security specialists with real-world experience carry out every project.

TEAM

Penetration Testing Team

A dedicated team performing intrusion testing across web, mobile, and infrastructure.

TEAM

Security Consulting Team

Consulting specialists supporting information security certification response and framework development.

LEADERSHIP

Seunghoon Lee, Senior Consultant

K-ISMS-P & ISO 27001 Certified Auditor, Certified Privacy Protection Officer (CPPG) — leads project delivery and client engagement.