Responses
He did put it silent. It was the alarm of the house not of the phone
TS mean the first time Seungbae in Sangwoo's house but forgot to silencing his phone and got busted by his co-worker call. And now Seungbae learn his lesson and put his phone on silent mode. It doesn't have anything to do with the alarm on Sangwoo's house.
Remember kids, when you're breaking into the same house where your phone ringing got you busted, put it on silent this time!
#Learningfromyourmistakes, thank you Koogi for this life lesson.