Guys I'm kinda confused 😭😭 can someone whose read the novel explain pls

he left the island, because I couldnt explain the feeling he had while he nearly killed taekjoo. but at the same time the headquarters (where zhenja works/zhenya is a weapon and at the same time a threat to them) made a plan to kill zhenja and taekjoo on the island, because that's where they were. but now that zhenja is back to work, he gets the mission bla bla bla. I hope that explains it to you, feel free to ask more, I read the novel like 3 times haha