She enjoys writing stories and fanfiction, but when she encounters a challenge named "Cherish for Eternity", she gets stuck on what to write and starts to ask her older sister on what she thinks. Little did she know, that her own story would soon be unravelling.

Meet Lee Aeshin, a 17 year old who has never had any experience of love or has any knowledge of what true love really means. This doesn't mean that her enthusiasm on creating romantic stories isn't any less. She can be quite dramatic at times and very forgetful. Her only family is her protective older sister.

Sick and tired of being ordered around and expected to be perfect because he's a rich kid, Cho Kyuhyun fights to be accepted for who he is and not his money. On the outside, Kyuhyun looks like he's one of those people that enjoys bullying and teasing others, pleasing his friends. On the inside, however, he longs to spend his days writing songs and playing his piano.

Lee ChaeMi, is Aeshin's 20 year old sister. She's a perfectionist, who loves to sing and she manages her own YouTube channel. Unlike her sister, ChaeMi has been through the ins and outs of love and has learnt to be wary of where she puts her trust in the men in her life. After her encounters with relationships, ChaeMi is protective of Aeshin and she fears for her sister's future experiences of heartbreak.

Lee Donghae is a dancing, singing, science geek; extremely handsome, but still fairly nerdy. He is very cautious when it comes to money and he doesn't like spending on things that he doesn't really need. His experiences with girls aren't the most pleasant, as during his high school years, Donghae was often teased and mocked because of his dorky glasses and strange hair cut. He has the notion that all girls are attracted to looks, til he met ChaeMi.