C411 Collin's Sudden Call

I ran up, but I didn't know which floor or room that bastard lived in. I stood in the corridor, feeling extremely anxious. I picked up the phone and called again, but naturally, there was no answer. I stood there for a moment in a panic. Then I hurried to the delivery room on that floor, grabbed the security guard, and said, "Help me find out which room Cao Zhiguo lives in