In which episode did Gotham riddle change?

Gotham fan was changed in episode 15. According to relevant public information, the synopsis of episode 15 is: a chivalrous man looks around for Gotham's notorious bastard, hangs on a weather balloon and rises to the sky. The media named him Balloon Man, who killed the businessman who made money by Ponzi scheme, the rogue policeman who paraded the streets and the liar who abused his power. The priest, Gordon and Harvey finally caught him through a series of investigations and prevented the recurrence of the tragedy. At the same time, the penguin character returned to Gotham and got a new job with a powerful person. Penguin character claims that Gotham will have a war because of Akam, and helps Gordon save Gotham. Gotham became a mystery. Gotham is an American comic adaptation TV series jointly produced by Warner Bros. Entertainment and DC Comics. It tells the story that James Gordon, a rookie detective, tries to crack down on the crime and corruption forces in Gotham from a new perspective, and gradually establishes a trust relationship with a young billionaire and a young Batman Bruce Wayne.