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Ch 15: So Taekang was a small enemy group (loan shark/gang) who’s info Sihyeon was trying to trade Daejun in exchange for info on “himself” (Sihyeon).
When he was still in his original body (Hajin) he had info on Taekang and was thinking of absorbing that group into their group.
I don’t know why Daejun would be warning him about Taekang when no one (Daejun excluded) knows Hajin is inside Sihyeons body and Sihyeon “shouldn’t” have any connection with them.