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It turns out that the gang that spread the video of underage sexual exploitation in a Telegram chat room used the subway station locker to pay for the entrance to the chat room. The police are catching up to 5 billion won in money and chasing the exact flow of money.

This is the exclusive report by Jeong Ban-seok.

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Jo Joo-bin, who exchanged crime profits through a so-called 'throw' method before an apartment fire hydrant.

SBS coverage confirmed that they used the subway station lockers as a crime tool.

This is Seoul Subway Gyodae Station. Paid members of the doctor's room changed the admission fee into Japanese yen and put it in the locker like this.

It is a way to exchange admission fees without encountering each other.

The police are tracking the cryptocurrency wallet, or account, that the person who put the money in the locker asks for an entrance fee. The police have secured 32 cryptocurrency accounts used by Joe's gang, including 17 Bitcoins, 11 Moneros, and 4 Ethereum.

A large number of accounts were created on foreign OTC exchanges, and about 80 billion transactions were captured at the time.

The virtual currency paid by the members was exchanged for cash by Dr. Kang Mo, who is called the PhD room fund book and nickname 'Buta'.

[Patrick Kim / CEO of Blockchain Security Company: It is not a difficult part if the public is to exchange cryptocurrency funds on domestic exchanges. I think that if you have a third person who exchanges money, you have no choice but to have an implied consent to illegal funds.]

Amidst this, Gyeongsangnam-do, a member of the doctor's office, evacuated Chun Mo, a public official at Geoje City Hall, who was accused of engaging in the production and distribution of pornography.

(Video coverage: Kim Nam-sung, Video editing: Park player, CG: Kang Yu-ra)

▶ "I'm not giving this reflection"… Judge Joo-bin wrote on the accomplice