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One more case of youth assault. A high school student, who returned home four days ago, was assaulted by a teenager. More than 30 people smashed one, and the police don't even know the identity of the offender.

Reporter Je Hee Won reports.

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More than 30 people begin to assault around one student. They fall on the floor and trample their heads and bodies, grabbing them from behind and striking them from behind.

When the victim attempts to flee, they are chased and blow their fists and feet.

On the 20th of the morning, 19-year-old A came home from the reading room and went to a church in Sinwol-dong, Seoul.

At the scene, several teenagers were stroking a female student, and they started hitting when Army A dried up. Assault continued for nearly five minutes, Group A was diagnosed four weeks ago, including fractures of facial bones.

[A / damaged student: Please stop saying it hurts so much, but I feel like someone is holding it behind me and nobody listens.

The parents who watched the CCTV were astonished.

[Army Father: How can you hit a child like that? It's really scary to put a child outside… .]

The police say the response was also a problem.

After the arrival of the police, some of the offenders remained on the scene, but they were sent back without proper identification.

[Army / Attack Student: The cop told me that the assailant would choose, and told me that I didn't have to.]

The investigation was made late, but because of the large number of people, I couldn't finish the identification of him after four days.

In the meantime, some of the offenders committed the second offense, including sending an SNS message mocking the victim.

(Video Editing: Kim Jong-tae, VJ: Lee Jun-young)