Yoon Jin Ah is a woman in her mid-30s who doesn't know yet what it's like to date a man. She's been dumped by a man many times because of her clumsy, reckless and foolish behavior. And again, a man she wanted to marry dumps her for the worst reason ever: that she's like bland, tasteless devil's-tongue jelly, which means she's not attractive at all as a woman. Just then, Joon Hee appears before her with a broad smile on his face. He's as refreshing as a soft drink. Joon Hee is Jin Ah's childhood best friend's younger brother, who used to live next door. Jin Ah has always remembered him as a little kid, but one day, he comes back as a really masculine man. When she is surprised by his change, her gut feeling tells her that she would truly fall in love this time.

Based on a popular 2017 Web Novel of the same name, it tells the love story between a lovely "sunbae" and a bold "hoobae".

The Crown Prince's wife gave birth to twins, but twins were considered an ominous sign. The twin daughter was supposed to be killed, but her mother begged to save her life. Secretly, the twin daughter is sent out of the palace. A few years later, the twin son Lee Hwi dies due to a disease. The Crown Prince's wife hides her twin son's death and brings her twin daughter back to the palace and raises her as Prince Lee Hwi. Lee Hwi eventually becomes a crown prince, but she is afraid her real identity will be revealed. Because of her secret, Lee Hwi is unable to have anyone close to her. She hides her emotions from others and she makes biting remarks. Jung Ji Woon is Lee Hwi's teacher. Jung Ji Woon comes from a noble family. He is handsome, smart and an optimist who enjoys life. Crown Prince Lee Hwi develops feeling for Jung Ji Woon.

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