Kang Dong Soo meets Yoo Shi Hyun when she mysteriously shows up and saves his life. When he finds a sketch of a ring he recognizes in her notebook, Dong Soo goes looking for Shi Hyun.

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The team struggles to locate Dong Soo before he does something drastic.

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Nam Sun Ho puts his plan in motion. Chief Moon agrees to join forces with Dong Soo for this case.

Nam Sun Ho's plan does not work out the way he expected. The team has a new case.

Dong Soo thinks he has figured out what is going on until Baek Woo Jin tells him that there is much more to it.

The team tries to figure out how they are going to find Tae Joon's notebook, but does it hold the answers they are looking for?

Tae Joon offers Do Jin an opportunity to meet the man in charge. Shi Hyun has to decide what she is willing to sacrifice for her brother.

Dong Soo and Shi Hyun investigate a case from 20 years ago and race to stop Do Jin.

Park Moon Ki asks to meet the Elder. Shi Hyun draws the funeral of someone on the team.

Dong Soo and Shi Hyun try to find out what Yoon Sung Soo knows. Park Moon Ki demands answers.

Dong Soo tells Young Shim his theory. Now they need to find some evidence to back it up.

Tae Joon is determined to prevent Tae Wook from contacting the Elder. Park Moon Ki finally gets to meet the Elder.

As more facts are exposed, Shi Joon's mission becomes more and more challenging.