Don't Look Back: The Legend of Orpheus^[1][2] (Korean: 상어; RR: Sang-eo; lit. Shark) is a 2013 South Korean television series starring Kim Nam-gil and Son Ye-jin. It aired on KBS2 from May 27 to July 30, 2013 on Mondays and Tuesdays at 21:55 (KST).^[3]

The series is the third installment of the revenge trilogy by director Park Chan-hong and writer Kim Ji-woo, following Resurrection in 2005 and The Devil in 2007.^[4]

Han Yi-soo's (Kim Nam-gil) father is the chauffeur of the owners of Gaya Hotel Group, the family of Jo Hae-woo (Son Ye-jin). The chauffeur is persuaded to take the blame for a hit-and-run accident caused by the drunken son of the family. But when he changes his mind, he is murdered before he can recant. Yi-soo, then a high schooler, tries to find out the truth and exonerate his father. He calls Hae-woo, his first love, but a truck deliberately rams the phone box. Following the attempt on his life, Yi-soo disappears and ends up in Japan, where a wealthy and influential Japanese-Korean businessman, Yoshimura Junichiro (Lee Jae-gu) adopts him.

12 years later he returns to Korea with a new identity as Japanese-Korean businessman Yoshimura Jun and carefully laid plans. Hae-woo, who believed that Yi-soo was dead, becomes a prosecutor to find out the truth about what happened to him. She marries Oh Joon-young (Ha Seok-jin), the son of the Chief Prosecutor Oh Hyun-shik (Jung Won-joon) and also a close friend of Yi-soo in their school days. No one in Korea, including Hae-woo, recognizes Yi-soo, even though he constantly finds excuses to meet Hae-woo and even after Hae-woo realizes that Yi-soo is alive. Yi-soo and Hae-woo become caught between love and revenge.^[5]

This production marked Son Ye-jin's return to television three years after Personal Taste in 2010,^[10] and the first acting project for Kim Nam-gil after being discharged from mandatory military service. Regarding his revenge trilogy, director Park Chan-hong explained that the first part, Resurrection focused on the man seeking revenge; then part two The Devil included the victim of revenge in the story; and the last part took into account both the victim and perpetrator in the structure of the story.^[4]

On April 29, 2013, the production company Annex Telecom released promotional stills of the two leads, Son Ye-jin and Kim Nam-gil, at the drama's first shoot on April 24–25 in Gangnam-gu, Seoul.^[11] This was followed by a 40-second teaser video on May 9, showing Kim and a shark swimming. Promoter Shall We Talk explained, "The reason we named the drama Shark and why Kim Nam-gil talks about sharks in the clip is because the lives of the two main characters are similar to that of sharks, which can't stop swimming."^[12]

1. Shark's Tale - Various Artists
2. 천국과 지옥 사이 (Between Heaven and Hell) - BoA^[13]
3. 슬픈 동화 (Sad Story) - Chung Dong-ha of Boohwal
4. Alone in the Dark - Various Artists
5. 몇 날 며칠 (Countless Days) - Na Yoon-kwon
6. Lost - Various Artists
7. 지독한 사랑 (Poison Love) - Lim Jeong-hee
8. Assassin - Various Artists
9. 고독한 왈츠 (Lonely Waltz) - Various Artists

In the table below, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.