Cha Ji-Won is a UDT officer of the Navy Special Operations Force. He is positive and has personal charm, but he falls into a desperate situation due to a friend's betrayal. He goes through numerous life or death situations. Cha Ji-Won then enters into a fake marriage with Swan to hide his identity. Through the bright persona of Swan, Cha Ji-Won falls in love and regains his trust of others.
It follows a devious plot of revenge and love. After searching for answers after a sudden tragedy, a man uncovers the betrayal of his best friend and devises a plot to exact revenge. To disguise his identity, he enters a phoney marriage with a young woman, but finds himself unexpectedly falling in love with her, which restores his trust and confidence in humanity.