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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.