
Yeah.
Spoilerss.
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Lee Kang lead a promiscuous life after juheon left him. He used drinking, drugs and sex to cope up with the severe headaches caused by the imprint. Then during his uni entrance exams, he fainted and was diagnosed with "abnormal pheromone shift syndrome or link". And so, he was on the hunt to find the omega who he imprinted with. The problem is, he had fucked a lot of omegas, so he was not sure who. He did not consider Juheon because he thought he was a beta. There are actually many details in the novel that are left out in the webtoon. So I suggest for you to also read the novel if you are interested.

Yeah.
Spoilerss.
.
.
.
.
.
.
.
.
.
.
Lee Kang lead a promiscuous life after juheon left him. He used drinking, drugs and sex to cope up with the severe headaches caused by the imprint. Then during his uni entrance exams, he fainted and was diagnosed with "abnormal pheromone shift syndrome or link". And so, he was on the hunt to find the omega who he imprinted with. The problem is, he had fucked a lot of omegas, so he was not sure who. He did not consider Juheon because he thought he was a beta. There are actually many details in the novel that are left out in the webtoon. So I suggest for you to also read the novel if you are interested.

You can find it on wattpad with the same title. It was also on Ao3, though its in spanish so, you have to google translate.
Here is the link
https://archiveofourown.org/series/1896847

Yeah. He really pisses me off too. I hate how he treated juheon harshly and in an arrogant manner after they reunited. I also don't like how juheon accepted him so easily. I kinda felt bad for Moochan. He really did help juheon in his own way. He was just bad at showing it so he was often misunderstood. This is really a struggle to read tbh.

Actually in volume 3 of the novel, after kang and juheon reunited again at the cafe, there was brief backstory of kang after juheon left him. It was detailed there how he lead a promiscuous life, how he was diagnosed with the link and was on the hunt to find the omega he linked with. This fact was used by Moochan in the later chapters to provoke Kang. Moochan told juheon about it, but, juheon does not care about it and told him that they love each other. I'm not sure if this part will be included in the webtoon.

So far, in the manhwa, it was only shown that after Juheon left Kang, he suffered severe headaches and later was diagnosed with imprint when he collapsed during uni exams. He need to find the omega he imprinted with. And that for the most part he in a lab/hospital in US to get treated.
I was actually quite confused as to why it did not cross his mind that juheon might possibly his link since juheon was the only one he had sex with in the manhwa. And so, I read novel. That's where I found out Kang fucked around with a lot of people so, he was not sure who he imprinted with.
I hope Juheon does not forgive kang so easily like that or better yet, try out some other guys first before going back to kang. It really irks me that lee kang gets to fuck around with other omegas while juheon stayed celibate for 8 years.