Im confused

As far as I've read, they know each other and Mc was abandoned by ML for engraving on him(? whatever that means).
Now they met again after 5 years and ML changed his opinion.

You mean they imprinted when the guide was just 13. I thought the story was starting just now. I mean he got rescued on the 1st chapter.

I haven't read much of the guideverse so I didn't know imprinting was a thing tbh
I just know there needs to be a certain chemistry percentage.

It's probably starting in the present and the rest will be a flashback.

so in chapter 1 they alr imprinted? so this is when they meet five years later isn’t it?

No, he was 18 when he was rescued from the IAK unit and imprinted after he came of age at 20. The imprint was by wavelength and it was MC who did it against ML's will. Then he was abandoned for 5 years during which ML tried to find a solution for breaking the imprint.

According to the novel, MC lacked any kind of masculinity and ML thought he was a girl. They haven't met for two years because ML was dispatched to Eastern Europe but he was eagerly waiting to get back to get imprinted with his female guide after she comes if age (20). It was then when he realized his dream guide is a male. They never had sex, between 18 and 20 because ML said he wanted to wait until MC comes of age and after that because he even vomited after kissing him. MC imprinted on home one-sided by wavelength right when it turned out he is a male and ML hated him for this.

Put it simply , seme is stupid ass he thought he fell for teenager uke at first sight brought him to guide agency and provided for his everything till he become adult since uke had long hair it makes him look like a girl so he is eager to become his mate and get married till they get tested with 96% capability highest for any pair than he saw uke is MALE vomitted in spot with anger and he shouted at uke for that he lied to him even though he send uke "girl panties and bra as birthday gifts" so he called uke pervert for that instant touch uke imprinted seme and he can't be with another person and blamed uke for that he didn't cut shot his living payments and went to mission again when he come back years later he started to get closer to uke but still he vomitted on spot by kiss and touches on uke which makes uke feel humiliated, seme also asked uke ti erase imprinting but uke suggested then make me suicide but said i didn't save you that day just to kill you like that .