No Go Jin is the most popular mathematics instructor in the private education field and the CEO of GOTOP Education. Even though he has only a high school level education, he has achieved all of his success due to his extreme intelligence. He seems like a perfect man with a handsome appearance, high IQ, and wealth. He is also narcissistic. One day, he is suddenly warned that he will be murdered. Lee Shin A works as No Go Jin’s secretary. She is a diligent and responsible employee. Due to her quiet and introverted personality, she has little presence with her boss No Go Jin and her colleagues at work. Her colleagues begin to recognize her, because she has worked for the notorious No Go Jin for more than 1 year. She then learns that she does not have much time left to live.
Episode 1
A genius Noh Gojin ignores death threats. His secretary Lee Sina gets deadly ill and dreams revenge.
Episode 2
Sina takes revenge on Gojin, but gets flabbergasted when he loses his memories from a car accident.
Episode 3
Sina pretends to be Gojin's fiancée to take revenge and finds tormenting him rather enjoyable.
Episode 4
Sina deceives Gojin's friend Segi and enters his house. Kang Min, who ran over Gojin, visits him.
Episode 5
Gojin deceives everyone by faking his amnesia. On the night of the accident, Gojin saw the culprit.
Episode 6
Noh Gojin hires the best private detective "John" to investigate. Sina keeps taking revenge on him.
Episode 7
After witnessing a young man's car accident, Sina accepts her deadly fate and stops taking revenge.
Episode 8
It turns out Sina's cancer was misdiagnosed. It is also revealed that Gojin does not have amnesia.
Episode 9
After they kissed, Go Jin and Si Na's hearts flutter. Go Jin speaks rudely to Si Na because of Soo Yeong.
Episode 10
The person who Gojin saw on the night of the accident was Oh Segi. Gojin's feelings for Sina grow.
Episode 11
After seeing Sina's will, Gojin realizes he loves her. Segi conspires to drive Gojin out of Gotop.
Episode 12
Gojin and Sina's romance begins. Gojin firmly believes Sina to be terminally ill driving her crazy!
Episode 13
Sooyeong challenges Sina to confess that Gojin was her first love. Gojin faces a crisis due to Segi's scheme.
Episode 14
Gojin overcomes the crisis, however the doubts on Segi's actions still remains. A surveillance camera shows another man when the accident happened.
Episode 15
Gojin sincerely apologizes to the people around him and vows to protect them. Sina roots for Gojin.
Episode 16
Gojin catches the culprit, and Gojin and Segi reconcile. A year later, Sina and Gojin are newlyweds.
