An enduring love story in 1987 Seoul; Young-ro, a female university student, treats the bleeding Soo-ho, a student attending a prestigious university, who one day jumps into a women's university dormitory despite the dangerous situation.
Yeong-ro, a fresh and lively freshman at Hosu Women's University, falls in love at first sight with Soo-ho at a group blind date.
Soo-ho comes into the window of Room 207 in Women's University Dormitory and collapses. Young-ro and others try to hide him from the officers.
Youngro takes care of the injured Soo-ho and tries to find a way to send him out from the dormitory.
Soo-ho, who leaves the dormitory, begins to secretly move again. Meanwhile, Lee Kang-moo secures decisive evidence of Soo-ho's whereabouts and pursues him.
Soo-ho negotiates with the head of the National Security Agency to escape the dormitory with his teammates.
Turning a blind eye to Yeong-ro who feels betrayed, Soo-ho continues the hostage crisis, and a doctor, Kang Chung-ya, is sent in to treat an injured associate of Soo-ho.
When Soo-ho realises Yeong-ro is the daughter of the head of the National Security Agency, he has no choice but to use Yeong-ro to make it out alive.
Soo-ho's heart breaks because of Yeong-ro. Meanwhile, the tension builds up as the hostage crisis makes it to the news nationwide.
Yeong-ro does not believe in Soo-ho's sincerity and eventually works out an escape plan with Gang-mu.
When the anonymous reveals their identity, Han-na carries out Gang-mu's order and moves to catch the secret evidence surrounding the hostage crisis.
Finally facing the cruel truth surrounding the hostage crisis, Soo-ho joins hands with his enemy Gang-mu and suppresses Cheong-ya.
With the situation getting worse, Soo-ho and Yeong-ro depend on each other more. Soo-ho and Kang-moo expose the scheme behind the presidential election.
Soo-ho comforts Yeong-ro who no longer trusts her father. Students are confused as to which side they should trust.
Soo-ho is heartbroken to see Yeong-ro struggling with guilt after hearing the news about her father. Soo-ho and Kang-moo start distrusting each other.
Giving up his hope in Cheong-ya, Soo-ho has no choice but to accept the head of the National Security Agency's proposal.
Soo-ho, who left Yeong-ro, stands at the crossroads of fate just before returning to his hometown.
Jung Hae-in
Lim Soo-ho
JISOO
Eun Yoeng-ro
Yoo In-na
Kang Cheong-ya
Jang Seung-jo
Lee Kang-moo
Yoon Se-a
Pi Seung-hee
Kim Hye-yoon
Kye Boon-ok
Eugene Jung
Jang Han-na
Huh Joon-ho
Eun Chang-soo
Park Sung-woong
Nam Tae-il
Kim Min-gue
Joo Gyuk-chan
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