A challenge that must be won - S1.E24

As the gang try to figure out a way to reach the top floor of Sae's casino Palace, Soujiro, who discovers a calling card in Futaba's room, is under pressure from Futaba's uncle, who is demanding that he pay him money or else give up custody of her. Ren gets Akechi's help to dig up dirt on the uncle, only for him to accuse Ren of pushing him. When government officials come to question Soujiro, Ren and Futaba manage to assure them that Soujiro is a good guardian, after which they come clean to Soujiro about being Phantom Thieves.