접속해 보니 별거 없다.

불러오는 JS파일을 확인해보니 이상한 []][][][] 배열들이 있었다.

[][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]][([][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]]((!![] + [])[+!+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + ([][[]] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+!+[]] + (+[![]] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+!+[]]] + (!![] + [])[!+[] + !+[] + !+[]] + (+(!+[] + !+[] + !+[] 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(!![] + [])[+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]] + [])[+!+[] + [+!+[]]] + (!![] + [])[!+[] + !+[] + !+[]]]](!+[] + !+[] + !+[] + [!+[] + !+[]]) + (![] + [])[+!+[]] + (![] + [])[!+[] + !+[]])()([][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]][([][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + 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[+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + ([][[]] + [])[+!+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (+(+!+[] + [+!+[]] + (!![] + [])[!+[] + !+[] + !+[]] + [!+[] + !+[]] + [+[]]) + [])[+!+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [!+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [+!+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]])[(![] + [])[!+[] + !+[] + !+[]] + (+(!+[] + !+[] + [+!+[]] + [+!+[]]))[(!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([] + [])[([][(![] + 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[])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]] + [])[+!+[] + [+!+[]]] + (!![] + [])[!+[] + !+[] + !+[]]]](!+[] + !+[] + !+[] + [+!+[]])[+!+[]] + (![] + [])[!+[] + !+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (!![] + [])[+[]]]((!![] + [])[+[]])[([][(!![] + [])[!+[] + !+[] + !+[]] + ([][[]] + [])[+!+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (!![] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]]]() + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([![]] + [][[]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]]](([][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]][([][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + 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(![] + [])[!+[] + !+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + ([][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]]]()[+!+[] + [+[]]]) + [])[+!+[]]) + ([] + [])[(![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (!![] + [])[+[]] + ([][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [][(![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]]()[+!+[] + [!+[] + !+[]]])())

이를 난독화 시킬 방법을 해매고 해매다 보니 FUCKJS를 알게됬다.

문제 제목에서부터 힌트를 준거 같다.

JSFUCK을 디코딩 시키면 위와 같이 플래그를 획득할 수 있다 !