
Choi Kang Chi is a half-beast and half-human and was adopted by a merchant Park Mu Sol when he was a infant. Kang Chi has a kind of unusual power. Dam Yeo Wool is the daughter of Dam Pyeong Joon who is the owner of the Invisible Knife Moo Kwan and also a patriotic warrior. Kang Chi and Yeo Wool meet and fall in love with each other. However, there is hatred between their fathers. Jo Gwan Woong is a traitor. He uses his power to frame faithful and upright individuals and obtain profit for himself. His criminal plots are destroyed by Kang Chi time and again. Therefore, he is determined to kill Kang Chi through different ways. Kang Chi is troubled by his identity but stands up for justice.






When the daughter of a noble family falls from grace, she receives help from a mysterious man.
Wol Ryung must endure 100 days of sacrifice in order to become a human. Gwan Woong refuses to give up the search for Seo Hwa.
Kang Chi's true nature isn't so easily hidden even though he was raised in a normal household. Yeo Wool is forewarned about a fateful meeting.
Trouble begins for Tae So and Kang Chi when Jo Gwan Woong appears at the Hundred Year Inn with ill-intentions and eyes for Chung Jo.
Kang Chi grows nervous as Chung Jo's wedding day approaches. Yeo Wool is drawn closer to Kang Chi the more they argue.
Kang Chi finds himself powerless as history repeats itself and his family is in danger.
Once Kang Chi discovers what he truly is, he struggles to accept it. Chung Jo finds herself in a familiar situation as seen with Seo Hwa 20 years previous.
Kang Chi learns that in order to achieve his goals, he must practice self-discipline and not rely on brute force all the time.
Dam Pyung Joon devises a plan to take back Lord Park's fortune right from under Jo Gwang Woong's nose.
Kang Chi discovers the truth about Yeo Wool. Meanwhile, Chung Jo is forced to spend time with Jo Gwan Woong.
When Kang Chi discovers Jo Gwan Woong plans to spend the night with Chung Jo, he devises a plan to rescue her. Yeo Wool is conflicted about her feelings for Kang Chi, knowing he loves Chung Jo.
When Kang Chi's true nature is revealed to Chung Jo, she cannot find it in herself to accept him.
Mysterious murders begin happening near Moo Hyung Do Gwan, and Kang Chi is targeted as the main suspect.
The widow of a wealthy Japanese merchant stirs up Jo Gwan Woong at the Hundred Year Inn. Wol Ryung has come back to life, in the form of a Thousand Year Evil Spirit.
As it becomes apparent that Kang Chi and Yeo Wool are developing feelings for each other, Master Dam forces them to separate and prepares Yeo Wool for her engagement with Tae So.
Kang Chi risks getting kicked out of Moo Hyung Do Gwan while undergoing Gon's famous "Bell Test", while simultaneously learning the value of building trust and relationships with people.
Tae Seo strikes a deal with Head Merchant Ja Hong Myung in order to take back the Hundred Year Inn.
Chung Jo unknowingly reveals the truth about Wol Ryung's death to Kang Chi, which creates a rift between him and Yeo Wool when it tests their trust in one another.
When the Head Merchant realizes she's taken her own son hostage, she must decide between saving him or blowing the cover she's worked 20 years for.
Master Dam teaches Kang Chi a hard-learned lesson by putting his own life on the line.
After a family reunion of sorts, Wol Ryung becomes conflicted between his evil nature and the faded memories that hold the key to his true self.
Yeo Wool decides to spend three last days with Kang Chi before sending him off to find the Gu Family Book, and in those days she grants him three wishes.
Kang Chi breaks up with Yeo Wool in order to keep her safe, but finds his decision may have had the opposite effect.
The battle with Jo Gwan Woong finally comes to an end. Kang Chi and Yeo Wool find out whether or not So Jung's prophecy comes true.