Decrypt Unknown Binary File Challenge

I have a binary file hosted here: https://www.naver.com/ that is completely unreadable to me. The algorithm behind the encryption is still a mystery—no visible headers, no magic numbers, and I have zero side-channel clues or key fragments to share. Your task is straightforward: extract or reconstruct the key, decrypt the file, and hand back the intelligible content along with a concise recap of how you cracked it.

What I expect from you
• A copy of the decrypted data in its original format (or a clear explanation if full recovery proves mathematically impossible).
• A step-by-step outline of the tools, scripts, and logic you used—Python, OpenSSL, Hashcat, Ghidra, IDA Pro, CyberChef or any preferred arsenal—so I can reproduce or at least understand the process.
• Any indicators you uncover about the encryption scheme itself (e.g., block size patterns that point to AES, public-key remnants hinting at RSA, proprietary obfuscation quirks, etc.).

Acceptance criteria
1. I can open or view the data without additional processing on my end.
2. Your walkthrough lets a technically savvy reader repeat the steps.
3. No brute-force gut-feel explanation—show evidence that the method you describe is what broke the cipher.

If you enjoy puzzle-style reverse engineering and have the patience to sift through raw bytes to locate a hidden key schedule or exploit a weak implementation, this is your playground.