主演：李泰彬 车雄基 吴民秀 车柱完
导演：未知
简介：dddOneday,a29-year-oldmantrapsasa19-year-oldyoungstudent,anextracharacterinsidethenovelthathis‘Sunbae(Senior)’waswritingandreceivesamission—tomakeChaYeonwoonhappywithin300days—otherwise,deathwillbehispenalty.Willhebeabletosurvive,toprotecthislovedonesandfulfillhismission