Ji Kui, who has lost her parents, meets He Yi who has run away from home, and out of some kind of psychology, takes her home. Although the girl is the same age as him, she has already graduated. Although Ji Kui is a little unbalanced, she still cares about He Yi. He Yi helped Ji Kui come up with ideas to pursue his senior sister, but Ji Kui himself did not express his position. He accidentally discovered He Yi's secret...
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