"My girlfriend isn't answering her phone." The suspect accused of murdering an international student was a graduate school instructor who reported the incident to the police himself.

A 25-year-old Chinese international student, who briefly entered South Korea to receive a completion certificate, was found cold in death just five days later.

In an era of 300,000 international students, how far have safety nets to protect them progressed?

(Reported and produced by Yeo Hyeon-gyo | Edited by Yoon Ye-ran | Design by Cho Seung-hyun | Assistance by Kim Chae-hyun | Produced by Knowledge Content IP Team)