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Ye-rin, a pharmaceutical researcher, accidentally gives her boss, Sung-hoon, an experimental drug-intended for clinical trials-instead of a headache pill. "My heart races whenever I see you, Ms. Lee Ye-rin. Why is that?"

Director : Kim Tae-ra

Writer : Yang Dong-joo

Cast

Park Xi-yeon

Shin Jeong-u

Lee Kan-hee

Son Min-hee

Choi Ha-seul

Lee Ga-gyeong