Key Points
Moonbin's sister Moon Sua pens heartbreaking note at memorial, Astro's MJ says 'I'm sorry I couldn't protect you'..
Astro member Moonbin died last week last week..
Fans have shared pics of letters from his memorial site...
One of them was written by Moonbin's sister, Moon Sua who is a member of the girl group Billlie..
According to Twitter user @astrohaluv, the translation of Moon Sua's letter is: 'Oppa it's me, your one & only precious little sister, Sua!.
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