A happy family suffers an accident, leaving only their son Tsukai out of the four members of the family.
This accident ended the case as a simple accident, but it was a huge murder with an behind-the-scenes conductor.
Who is the real killer and who is behind it?
Tsukai, who could not bear the pain of losing her family at the age of twelve years old, escapes from reality and leads a life of refuge. It goes through many difficulties on the way and goes to the new farmhouse, which is said to be haunted by savages.
Wandering deep in the mountains, he meets a life saver on the threshold of death. At last, Moorim, who was reclusive in the mountains, survived his life and became his disciple.
After that, he worked hard to learn martial arts for 10 years. To avenge the enemies who murdered their parents in the future...
Ten years later, Tsukai descended and renamed Tsuo-Tan, and set out to find the enemy who killed her parents. Then he gets information about an organization called a “blacklist”, and he joins the organization and tries to find a clue to the incident.
As a result of working in the organization for a long period of time and finding clues, we learn that the killer who murdered his family at that time belonged to this organization, but it is composed of a powerful organization that cannot be touched, so Tsu Tan's ability cannot handle it.
As time goes by, he connects with many people. Dongfangqing (方情), Baisei (白雪), Yi Jingjing (李), Meo Jun-yin (莫君言), Ye Ke-Ker (可可), etc... And Toya and Uya are friends who were made during the mission.
After that, he chooses revenge at the crossroads of friendship, love and revenge...