Raw spoiler
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Just read the raw of the latest chapter and it's so cruel, too cruel. I'm in pain, heartbreaking. We're finally getting to where ch1 started...but the cost, too much. I need to take a break for a while, prepare yourself everyone.
They're step siblings. If they kept "noona" when translating, the tone would have been better than using "sister".
To those who want to see the adorable babies, the artist post a family portrait with the babies for chuseok on twitter!