So for the Blackmail 2, the code of the rooms are random, you must try different combinations which is suprisingly easy as on the lower right of the screen it's showed if a number is right or not so you just need to do stuff like "0000" to see if there's any 0 in the code and not and then continue as such with the other numbers.
On another note i'm also wondering about the NTR matter too as the tag ain't there anymore (even tho the cheating one is) so i'm kinda wondering if the uncle is going to cuckold us or not u_u