Because of suddenly suicide of Cheon Ji, Hyun Suk and Man Ji get out of their homes and move into an apartment to live. Accidentally, Man Ji has heard a story seems related to the death of his sister after witnessing the death of a friend's sister. Trace many clues, Man Ji discovers Cheon Ji's friend, Hwa-yeon, who is behind all of these sequences. While searching for the secret behind the death of his sister, Man Ji finds a message that Cheon Ji leave in a red wool rolls.