>>51628524PM19 was teased at the end of August with a full reveal following in September. SM had its reveal in September. This is unusual for sure, which makes me think what's coming might not be a SV anime - or if it is, it's coming later than expected.
Maybe episode 131 is the last episode, but I wouldn't say for sure that it is... in part because I still don't believe the leakers have actually watched that far ahead (since they've never had access to so many episodes weeks in advance).