Sharks don't have lungs, but they do have to breathe oxygen to survive. Instead of breathing air, though, sharks get oxygen from the water that surrounds them. So they have to move around, if they stop moving for a while, they sink into the water and die, So Sharks have to move and move constantly from birth to death. The same goes for you. If you want to survive, keep moving, then you will be the best hunter... like a shark.
 
(Source: Kakao, translated)

“Don't flaunt your money in Yeo-Su, don't boast about your connections in Suncheon, and don't show off your fists in Beolgyo.”
There's an old saying like that... 
Hyun Woo-Yong, an 18-year-old high schooler who brazenly flaunted his fists in Beolgyo. After serving two years at the Cham Bit Juvenile Correctional Facility, he returned to high school at age 21. He tried desperately to graduate like any ordinary student, but... But in this place where school violence runs rampant and injustice abounds, his patience reaches its limit and explodes.
 
The extraordinary past of ‘Shark’ Season 2's villain, Hyun Woo-Yong, is revealed. (Source: KakaoPage, translated)

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