Sector 7

In Sector 7, an underwater oil field located south of Jeju Island, Hae-jun is working as a marine equipment manager on an oil prospecting ship called Eclipse. Joining the crew later is Jeong-man, a former colleague of Hae-jun's father, assigned to Eclipse as captain. Though his job is to oversee the withdrawal of the ship, he suggests conducting some drilling one last time.

• 
  Kim Ji-hoon
• 
  Park Hyun-cheol

• 
  Ha Ji-won
  Cha Hae-joon
• 
  Oh Ji-ho
  Kim Dong-soo
• 
  Ahn Sung-ki
  Lee Jeong-man
• 
  Park Cheol-min
  Do Sang-goo
• 
  Song Sae-byuk
  Go Jong-yoon
• 
  Lee Han-wi
  Jang Moon-hyeong
• 
  Cha Ye-ryun
  Park Hyeon-jeong
• 
  Park Jeong-hak
  Hwang In-hyuk
• 
  Park Young-soo
  Jang Chi-soon
• 
  Oh Min-suk
  Yoon Hyun-woo
• 
  Kim Ji-young
  Young Cha Hae-joon
• 
  Jung In-gi
  Cha Hae-joon's Father
• 
  Kim Hyeong-seok
  Sailor
• 
  Kim Min-jae
  Helicopter pilot
• 
  Kim Dong-hyeon
  Drilling Worker 2
• 
  Kim Pil
  Drilling Worker 3