剧情介绍
Oneday,a29-year-oldmantrapsasa19-year-oldyoungstudent,anextracharacterinsidethenovelthathis‘Sunbae(Senior)’waswritingandreceivesamission—tomakeChaYeonwoonhappywithin300days—otherwise,deathwillbehispenalty.Willhebeabletosurvive,toprotecthislovedonesandfulfillhismission
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