Something Unexpected

Two people who are completely known for their groups become familiar with each other under a certain situation. A situation that cannot be predicted and one of them unexpectedly need the other one for help.

"You help me from danger. I was traumatized by that incidents. Nobody could help me except you. That is why my company need your help. Because you are the only one who I am comfortable with. But the feeling change from comfortable to something else. A feeling that I have yearn for years." - Moon Byul Yi

"I shouldn't help you! If I know this could happen, I wouldn't agree to be with you. I never expect for you to be my greatest sins. All I have done with you is hide and tell lies to others. Telling them that you are just my friends was a complete lie. Your company trust me to help you but instead I fall for you." - Im Changkyun

What would happen to this two people? Will there be any changes in their lifes or it will stay the same as before? Will their friends know what happen between the two of them?
Well lets just say that everything will happen unexpectedly.