Dongwoo, who happened to find the secret of his squad leader, is spending a hellish day because of it. Jungyeon, the younger sister, found out about her brother’s suffering through his diary. To protect her brother whom she loves more than anyone else, Jungyeon visits Yoo Jinho, the squad leader… “Oppa… I’ll protect you this time.”
My Sister’s Duty Manhwa also known as My Younger Sister's Duty / Sister Duty / Dongsaengui Uimu / 동생의 의무. This Completed manga was released in 2020. This series was written by Eolluk and illustrated by Keunson. My Sister’s Duty is about Drama, Mature, Romance story.
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