Could 你 please tell me which members of suju have left and why? 支持 will be given.

Kibum - to pursue 表演 career
Kangin- to enter in the military
Hangeng - because of slave contract

The two haven't left actually, Kibum and Kangin only Hangeng. 你 can see the info in Wikipedia.

Hangeng, Kibum, Leeteuk, Kangin, and Heechul.
Hangeng left because of 'slave contracts'. He was treated badly 由 the company, and did things that weren't on 13-year contract with SM. He filed a lawsuit against them, and you'll find lots of info about it if 你 搜索 up Super Junior lawsuit. As for Kibum, he hasn't exactly left the group. But he chose to continue his path as an actor. ELFs are still waiting for him to come back. As for Leeteuk, Kangin, and Heechul, they've gone to their mandatory army service. Kangin's actually come back not too long ago. Now Leeteuk left not long 以前 either.

Prom15e to 13elive!