There are a total of 49 problems of Lord of SQL Injection including 'All Clear'. Even if you don't understand the problem, you can find many Korean explanations online.

How to Tame SQL Injection As part of its Secure by Design initiative, CISA urged companies to redouble efforts to quash SQL injection vulnerabilities. Here's how.

Errors that allow SQL injection and cross-site scripting attacks are still the top vulnerabilities that pen-testers find, especially at smaller companies.