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Watch this episode on YouTube https://youtu.be/aYun0l_kjqo
We see a young Han Su as a math tutor for a wealthy US family. Han Su's father steals money from the Yakuza and desperately tries to keep Han Su out of it. The great Kanto earthquake of 1923 happens, which eliminates his chance to go to the US and facilitates his entry into the Yakuza.