Ga-eun and Su-ho grew up like brothers and sisters. However, Su-ho never showed that he likes Ga-eun ever since they were young. One day, Suho accidentally found Ga-eun's diary and found out that she also likes him. Su-ho reveals his feelings to Ga-eun. Ga-eun is not his real sibling, but to protect their parents, she rejects him...
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![[NC] 누나의 일기-무삭제판_메인 예고편(2019)](https://i.ytimg.com/vi/eVr2QynYmwE/hqdefault.jpg)
