Korean drama hacker fortune telling

I watched a TV play, which was played by LEE JOON GI. Every time I steal it, I leave a plum blossom.

One Plum is a Shui Mu mini-drama produced by South Korean SBS TV in 2008. Adapted from Gao Yurong's cartoon A Branch of Grand Theft Auto, directed by Li Yongxi, written by Cui Lan, starring Li Junji, Han Xiaozhu, Park Sihu and Li Yingya.

Li Xi (LEE JOON GI) witnessed his father's murder because of the court coup, and his mother and sister became prisoners. He suffered from amnesia and later became the adopted son of Tieshi's family, and was named "Yong 'er". Yong Er gradually grew into a street thug, accidentally regained his memory and began to doubt his father's death. The only clue is the sword that stabbed his father to death and the pattern on it. In order to find the sword and the real murderer, the brave man turned into a masked thief at night, leaving a red plum at the scene of the theft and turning into a famous righteous thief "Zhi Yi Mei" in the Jianghu.