S1 • E1
When Sun Ho meets a girl named Oh Kang Hee and falls in love with her, his aimless life is turned upside down. He even goes one step further and applies to the school Kang Hee is applying to. All Sun Ho cares about is getting accepted so that he can be with her. But just when he thinks he has almost made it, someone he would never have expected shows up and gets in his way.
S1 • E2
Sun Ho can't believe that his interviewer is Dong Man from the illegal money transfer. However, Sun Ho finally gets the acceptance letter. Meanwhile, to become an officially registered student at the Police University, one must endure the exhausting Chungram training and its training professors.
S1 • E3
In order to stay at the police academy, Sun Ho has to lead his unit to victory in the last round of training. He even asks Dong Man for advice, but to no avail. Meanwhile, Dong Man realizes that something fishy is going on at the university regarding the illegal gambling site.
S1 • E4
After hearing that Chul Jin, his partner, has been ambushed, Dong Man closes in on those responsible for the illegal gambling site. However, without any hard evidence to prove anything, Dong Man is at a dead end. Meanwhile, Sun Ho finds out who Dong Man really is when Dong Man asks him for help, and Sun Ho considers whether to accept his request.
S1 • E5
Dong Man accepts that even he can get carried away by emotions while investigating cases and decides to take Sun Ho on as his partner. The duo starts to dig deeper into the case in which Hyuk Phil is the main suspect. Meanwhile, Sun Ho's behavior gets on Kang Hee's nerves more and more.
S1 • E6
Sun Ho can't remember anything that happened the night he fainted, and Kang Hee can't believe that he can't even remember their first kiss. Meanwhile, Sun Ho has to win the prize at the Chungram Sports Festival to make up for his mistake. At the crucial moment, however, he receives a signal that points to the presence of a prime suspect.
S1 • E7
Dong Man is sure that he will finally catch the culprit this time with Sun Ho as his partner, but it is none other than Chul Jin who shows up as a new professor. When the investigation hits a dead end, Dong Man begins to take extreme measures to continue the search, but Sun Ho disagrees with his way of handling the situation and stands in his way.
S1 • E8
Dong Man has trouble accepting the fact that all the evidence points to Chul Jin as the culprit, and then the questions for the upcoming exam are leaked. Sun Ho and the gang drop everything else to prove that Dong Man has been framed. But for some reason, Dong Man decides to confess that he did it.
S1 • E9
When Chul Jin confesses that he was responsible for the exam leak, it puts Dong Man in an awkward position. Although Dong Man's intentions were pure, he realizes that he is doing more harm than good to those around him and decides that it's time to make a change. Meanwhile, Sun Ho and Kang Hee also find their own reasons to join Dong Man's investigation.
S1 • E10
Dong Man has left the police academy without knowing that a burner phone Sun Ho is tracking has just received a signal. Sun Ho assembles a unit with Kang Hee and some others to investigate the location pinpointed by GPS. Meanwhile, Dong Man focuses on what he can do to solve the case on his own, as he receives important information from Kang Hee's mother.
S1 • E11
The culprit behind the illegal gambling site is caught and the students continue to enjoy their summer vacation. However, Dong Man can't get the case out of his mind and continues to look for missing pieces. As the new semester begins, Sun Ho, Kang Hee and others focus on their studies, and that's when Sun Ho receives a message from a stranger.
S1 • E12
It's likely that the enemy is inside the organization, and Dong Man now has to suspect his colleagues and friends. At the same time, a stranger sends Sun Ho the statement he wrote when he was caught stealing illegal gambling money. Sun Ho can neither ask for help nor tell Dong Man about the stranger. Sun Ho is at a dead end.
S1 • E13
Sun Ho just can't stand by and do nothing while the bad guys get away with what they want, so he decides to put his decisions into action. Sun Ho has to decide if he wants to save himself or Dong Man. Meanwhile, those who tried to help Sun Ho and Dong Man also get into trouble.
S1 • E14
The ledger with the records of the illegal transactions is found by Sun Ho, but after going through the ledger, Dong Man strongly believes that the culprit is Hee Soo. Meanwhile, Chief Han's last attempt to stop Dong Man's investigation puts both Sun Ho and Dong Man in a dilemma.
S1 • E15
It turns out that the head of the Zelkova Tree Foundation is also responsible for the illegal gambling ring, and Dong Man and Sun Ho finally come face to face with the gang leader. Eventually, the doubts surrounding the foundation are resolved one by one.
S1 • E16
Sun Ho decides to quit school before carrying out his last plan. At the same time, Dong Man searches for a way to support Sun Ho in the best possible way. Years pass and everyone gathers at the university again, hoping to meet the one they care about the most.
Yoo Dong Man
Kang Sun Ho
Oh Kang Hee
Choi Hee Soo
Park Min Kyu
Yoon Seung Bum
Cho Jun Wook
Noh Bum Tae
Lee Eon-ju
Yoon Ji-hye