國煌的未婚妻艾琳被人殺死，他懷疑是曾經寄騷擾簡訊的家豪所為，但家豪否認。警方在家豪躲藏處找到證據，藍天驗證后證實家豪并沒有說謊，這使得一心要幫國煌抓到兇手的組員們感到氣餒。Episode7Guohuang’sfiancée,Ailingismurdered。HesuspectsJiahaoisthemurdererbutJiahaodeniesit。ThepolicefindsomeevidenceatJiahao’shideoutbutafterLantian’scloseexamination,Jiahaoisfoundtohavespokenthetruth。ThisfrustratestheteammemberswhoarebenttohelpJiahaofindthekiller。