이후 고시원에서 함께 생활하던 지인이 서씨 휴대전화를 확인했는데 단 하나의 전화번호도 저장돼 있지 않았다고 했다.
Afterwards, an acquaintance who lived with him in Gosiwon checked Seo's mobile phone, and said that there was not even a single phone number saved.