[Coi general] Spoil me Pretty please, at which chapter do others find out klien's secret?!

I finished lotm book 1 two weeks ago, i wanted to start Coi but i really wanna focus on my career thingys, i already wasted the entirety of 2 months reading book 1

It will take a few months before i read Coi, but since CF isn't gonna write any other squels for the moment, i want to know when did the tarot club and others find out about kliens secret being the fool?!, and can u jsut give a brief summary on their reaction to this matter, especially leonard (if he finds out that is)?!

I know that klien released the other transmigratora out of their shell, do they find out that the fool is the transmigrator or would they think gehrman is the transmigrator??