Yoon-hee dresses as a man to provide for her family by copying manuscripts. When the debt collectors up their game, Yoon-hee decides to do the same.

Sun-joon arranges for Yoon-hee to take the imperial examinations under her brother’s name, but her answer on the test catches the eye of the king.

Yoon-hee saves Sun-joon from the upperclassmen’s initiation punishment, but she gets herself into a new spot of trouble.

Classes begin, and Yoon-hee attends her very first lecture. In-soo’s hatred of Sun-joon leads him to set his sights on Yoon-hee.

Professor Jung stumbles upon Yoon-hee’s secret after her rescue. Later, Sun-joon helps Yoon-hee prepare for the archery competition.

Professor Jung tells Yoon-hee she must win the archery competition to continue her studies at Sungkyunkwan. Yoon-hee and Sun-joon continue training.

Yoon-hee’s team and In-soo’s team go head to head in the archery contest, but someone is plotting against Yoon-hee in the shadows.

In-soo embarrasses Yoon-hee in front of everyone. Yoon-hee dejectedly heads home, but someone is secretly following after her.

The scholars return to find their valuables missing, and people suspect Yoon-hee. The king presents her with a way to prove her innocence.

Sun-joon runs into trouble in his search but is saved from danger. A vital clue helps to finally reveal the identity of the true culprit.

The king’s investigation takes a surprising turn. Yoon-hee opens up to Sun-joon, who says he wants her to stay by his side.

Sun-joon and Yoon-hee spend a night stranded on an uninhabited island. Sun-joon struggles with his emotions. Jae-shin and Yoon-hee grow closer.

Yoon-hee tries to mend her relationship with Sun-joon, but he reacts coldly. Sun-joon and Jae-shin clash over Yoon-hee.

The rumor that Yoon-hee and Jae-shin are lovers spreads like wildfire. Yoon-hee thinks Sun-joon started it. In-soo calls for an inquiry.

After the inquiry, Sun-joon drops out of Sungkyunkwan and decides to marry Hyo-eun. But before he does, he confesses his feelings to Yoon-hee.

Sun-joon is shocked to find out that Yoon-hee is a girl. He tries to convince her to drop out before her secret gets out, but Yoon-hee wants to stay.

In hopes of reforming Joseon, the king gives the group a secret mission. As they work to solve a mystery, Sun-joon and Yoon-hee share their feelings.

Sun-joon is stunned by his father’s implication in the incident. He looks for the one witness who can reveal the truth, but the trail goes cold.

When Jae-shin is injured, Sun-joon names himself as the Red Messenger. Yoon-hee leads the student body in an attempt to save Sun-joon.

The king accepts the students’ petition and releases Sun-joon. Yoon-hee receives the king’s thanks for her efforts. In-soo learns Yoon-hee’s secret.