Responses

It's from the scene after Moondae's breakdown after finding out the truth from his real parents death.
He deliriously use informal speech to Chungwoo and kinda talks down to him a bit.
When he calm down later on and have a conversation with Chungwoo ends it with, "But Moondae, remember I'm still a hyung to you, you know."
I'm waiting on that scene when Chungwoo gets mad when Moondae accidentally talks down to him.
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