After a messy break up with her boyfriend of 2 years, Choi Seungcheol, Yoon Jiyoon's bestfriend decided that it was the time to move on. So, she brought Yoon Jiyoon to a party. But, what Yoon Jiyoon wasn't expecting is, out of all times, that she'll meet her ex husband, Hong Jisoo, for the first time in 5 years.

To The Boy I Once Loved:                             Thank you for showing me that not every failed love will hurt. Thank you for helping me to rise again when I was at the rock bottom. And finally, thank you for making me a way for a new love.

A fairy was sent down to save people's life and met a heartbroken man giving up on his life. A man was heartbroken after he was left by his girlfriend of 3 years and was saved by a fairy on one night.

Park Jiyoon had a pretty normal high school life. She had excellent grades, friends with almost everyone in the school, heck, she was even the school's vice president. Until one day, 13 flower boys entered her life. Her life suddenly turned into a chaos. All they wanted was to be close to her. But, she had a trust issue. This question have been running in her head, "Is there anyone I can trust?"

She was a princess and he was her bodyguard. As time goes by, they've gotten closer. Neither of them realised that they need each other. Until an unwanted incident occurred.

Minatozaki Sana has found the right one. Just to test his patience, she decided to confess but let him wait to know his sincerity loving her.