She Was Pretty (2015)

Both are written by the same writer with similar genre of romantic comedy. Both have Shin Hye Sun in it which show how amazingly far she's come from being a support character in one show and the main lead in the other. Also it shows her range as both characters could not be more different. Both male leads have PTSD that often interfere with their lives and the love of someone from their childhood who they didn't recognize initially brings them both out of their hard shells to help them return to who they were when they were younger. Both shows have great moments of Womance though in 30b17 the women are not love rivals. Both have a lot of humor and heart.

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide

Remind me of High School Debut starring Mizubata Junpei. ML is popular guy & many girls like him in his high school. FL is the opposite of ML but slowly progressing they fell in love with each other before they realized it. FL make a promise not to fall in love with ML but she was hiding her feeling for him. Cute & lovely high school love story.

As a young girl, Hye Jin was impossibly cute and lived a comfortable life with her wealthy parents. Since entering her teens, both her looks and fortunes have drastically changed. She currently lives rent-free with a friend and is a part-time clerk at a convenience store. Out-of-the-blue, Sung Joon, her childhood friend, contacts her and suggests they meet. He is unaware that Hye Jin recently spotted him and knows how fit and handsome he had become. Not wanting to disappoint him, she insists her pretty best friend go in her place. What could go wrong?
After landing a full-time job, Hye Jin is surprised to find out that Sung Joon is her boss. To add insult to injury, he is treating her with nothing but disdain and contempt. This is not the friend she fondly remembers, so she goes about hiding her true identity from him.