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Identity: It's a fanmade MSA anime and manhwa.
Background: In Seoul, Korea, a 29-year-old older brother named Min-soo had always been stern with his 6-year-old sister named Soo-na so much she cried a lot thst his mom told him, "Min-soo, you mustn't yell so roughly at Soo-na, she's only 6." What happens next?