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When Saeyoung was sent to the Secret Intelligence Agency, he met Celestine, the daughter of BOSS. The two became inseparable until Christmas week years later when they both had individual missions. Celestine, never came back... The place she went to was to Eternal Paradise...
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Will Saeyoung have what it takes to rescue his beloved? Or will he fail and become the next brutal agent?
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Behind The Mask is a tale of an incredibly talented assasin whose power is equal to that of a Prime Minister. The mask stays on no matter what.