Jung Sena - 

a doctor in training , basically a trainee. 25 this year , a lady with words of encouragements. lives in the residence provided by hospital for them. lives next door to the flower boy looking mentor of hers , Kim SeokJin , her nightmare. a doctor under pediatric of Seoul National Hospital . she loves children. 

Kim SeokJin - 

a flower boy looking doctor who graduated 2 years ago. 26 this year, one of the young doctors under pediatric. a children lover . the reason behind becoming a pediatrician. lives next to the blur + messy looking Jung Sena. captures lots of hearts of young nurses and patients. can be strict at times. the scariest nightmare Jung Sena can have. The monster mentor, that's what Sena calls. 

story line - 

"When you're afraid, run.

                 If it's too dangerous, avoid. 

                             don't be like a moth and keep going forward"

 

-Love 911. 

Sena, a lady with words of encouragements encounters with a man , her mentor , who has carried guilt and regret with him ever since 2 years ago. He may be a flower boy looking all great and cheerful but no one knows what's inside him. Will Sena be able to encourage this mentor of hers to open himself up again or will he shut her out too? .