While looking for the cryptic creator of an innovative augmented-reality game, an investment firm executive meets a woman who runs a hostel in Spain.

1. Episode 1 67m A frantic young man is running scared in Barcelona. CEO Yoo Jin-woo heads to Granada on a quest after getting a strange call while on business in Spain.

2. Episode 2 62m Jin-woo learns that Jung Hee-ju may hold the key. While trying to locate Se-ju, he notices that a new user has entered the immersive virtual universe.

3. Episode 3 72m As Jin-woo gets deeper into the game, he encounters a guitarist who looks uncannily familiar, and later makes an offer to Hee-ju that she can’t refuse.

4. Episode 4 67m Hee-ju and her family are elated over their sudden good fortune. Jin-woo contends with the shocking turn of events and tries to decipher the situation.

5. Episode 5 62m Hee-ju makes a shocking discovery. Jin-woo tries to deal with an unwanted visitor at the hospital and thinks he knows what happened to Cha Hyeong-seok.

6. Episode 6 69m Jin-woo sets out to handle Cha Hyeong-seok on his own but is compelled to accept Hee-ju’s help. Steeped in doubt, Jin-woo makes an abrupt decision.

7. Episode 7 74m The game moves to Seoul. Pursuing a hunch, Jin-woo continues to level up by killing new -- and old -- enemies. Jin-woo notices Hee-ju seems different.

8. Episode 8 64m Hearing about Se-Ju, Hee-ju is devastated -- and her belief in Jin-woo shatters to pieces. Jin-woo stumbles upon a peculiar behavior in the game system.

9. Episode 9 60m Convinced that only his delusions make any sense, Jin-woo embarks on a secret quest to find Se-ju upon receiving a special message to return to Granada.

10. Episode 10 65m Unable to ascertain Seo Jeong-hun’s whereabouts, Jin-woo proceeds alone after retrieving a parchment message instructing him to go to Alhambra Palace.

11. Episode 11 68m News of Jeong-hun plunges Jin-woo into a nadir. Attacked from all sides, an old enemy goes on the offense and strikes a blow -- but Hee-ju is there.

12. Episode 12 63m The reopening of Cha Hyeong-seok’s case worries everyone but Jin-woo asserts he has nothing to hide and tells Hee-ju that he’s not going anywhere.

13. Episode 13 60m While news of Jin-woo hits the airwaves, he resumes the quest and has Hee-ju talk with Emma, hoping to get some clues related to the enigma.

14. Episode 14 64m As he levels up further in the game, Jin-woo is ambushed by attackers all around him, but things get more precarious when he’s chased by the police.

15. Episode 15 64m Se-ju comes home and the quest appears complete, but Jin-woo realizes that there’s a bug in the system as he embarks on the final story -- his own.