Iron Man

On rainy nights, mysterious incidents happen where the trees lining streets are found cut. Joo Hong Bin, the CEO of a major video game company, is unable to control his ill-temper toward his incompetent workers. Meanwhile, Se Dong, the nosiest girl in the world, getting busy after learning the video game developed by her team, has been sold to Joo Hong Bin, ends up taking care of an abandoned boy she meets at the airport.

Hong Bin, who smells his first love, Tae Hee's, fragrance from Se Dong, is preoccupied with thoughts about Se Dong. Meanwhile, Se Dong's friends, discouraged after losing their game, deface a wall of Hong Bin's house. Se Dong, in need of $100,000 in settlement money as well as her friend's hospital costs, goes to find Hong Bin but leaves when he refuses to give in.

Hong Bin, finally having met Chang, is shocked at hearing the news implying Tae Hee's death. Meanwhile, Se Dong lovingly cares for Chang, who is unable to adjust to a new environment. Hong Bin, having seen this, offering a high salary, asks Se Dong to work for him as a babysitter as an excuse to keep her close to him. But Se Dong, disheartened by Hong Bin's arrogant and ill-tempered behavior, rejects his offer.

Hong Bin encounters a crisis during which the truth that blades come out of his body is nearly revealed. Thanks to Secretary Go, the only person who knows of the secret, Hong Bin narrowly escapes the crisis. But Hong Bin, aware the series of recent strange incidents are related to him, presses Secretary Go and begins to fit together the fragmented pieces of vague memories. Se Dong, officially having become Chang's babysitter, is afraid of a monster within Hong Bin's house.

Se Dong, having learned about Hong Bin and Tae Hee's past, encountering a crisis puts herself at risk and retrieves a photo of Tae Hee treasured by Hong Bin. Hong Bin, having seen this, his feelings for Se Dong deepen even as he grows confused. At that moment, Hong Bin confirms Tae Hee's death. Feeling pained, he is shocked by the sight of blades coming out of his body. Just then, Se Dong, looking for Hong Bin, opens the door to his room.

Hong Bin is enraged at learning his father, Jang Won, had instigated thugs to beat Tae Hee in an attempt to take Chang away from her. Meanwhile, the story behind Secretary Go's reckless loyalty to Hong Bin is finally revealed. Se Dong, disappointed by the theft of music her team had worked hard to complete, stands off with the Global Games workers. At that time, Madame Yoon plots to lure away Hong Bin's son Chang.