It is written about a sister who is far away in a foreign country and misses her sister day and night, which turns into love under unexpected circumstances. After returning home, the two recognize each other, but the relationship cannot be the same as before. The sisters make difficult choices between family affection and love, ethics and morality.
This article may be a big pit, with many possible endings, but no one will die anyway.
Ending 1 [Two sisters are together]
The ending [the elder sister and the younger sister loved each other, but the younger sister chose to leave]
Ending 3 [The elder sister loves the younger sister, the younger sister does not love the elder sister, and then they are separated]