The Trojan horse: the Professor knows the nurse is a cop
The Professor tells Berlin the nurse with glasses is a cop. Flashback: the Trojan horse lesson, a hoarse-horse rhyme, and letting the police think they win.
Tag
#undercover cop
2 moments.
Jun-ho phones his chief for backup from the island
On the run with the Front Man's order to take him alive, Jun-ho gets a broken signal to his chief and begs for police and coast guard.