L.U.C.A.: The Beginning Temporada 1 Episódio 1

Ji O wakes up from losing his consciousness and has no clue where he is. In fact, he isnt sure who he is either. He just knows that he has a body covered in wounds and there are fallen people all around him. One man walks up to him with a knife in his hands. A year goes by and Gu Reum, a police officer, finds out that the man she was searching for is dead.