Don't Call Me Sister

Don't Call Me Sister Plot:

After graduating, Lin Wan works as an operations specialist at a startup. Her housemate Shen Xing, a junior underclassman, always calls her "Sister" affectionately. Lin Wan is flustered but troubled—she’s only two years older than him, and hates being treated like a mere junior. At a company bidding meeting, Shen Xing shows up as the investor’s representative, correcting her publicly: "Don't call me your underclassman, don't call me sister either. I'm courting you as an equal." It turns out three years ago, Lin Wan helped the lost high schooler Shen Xing on a rainy night, and he’d remembered her ever since. He moved to her city on purpose to get close, but his hidden identity and deliberate approach left Lin Wan torn between confusion and heart flutters.