Responses
I realised people may not want to look through the comments so here’s a spoiler
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He turned to a life of drugs and sex during those 7 years. The reason he had no clue which omega he marked was because 1) he didn’t know MC was an omega, but also because he messed around with so many omegas and couldn’t figure out which one he marked
I don't exactly want Kang to suffer, I just don't want the story to end in the predictable "happy" way BLs or really any romance does; the MC being oblivious and forgiving every and anything. The novel has said that he's done some effed-up things during those 7 years, and he's yet to mention it to MC yet. Not even once.
"We've all done bad things, what's different about him?" Is in a sense correct, we know this, but that's not the main issue here. It's the fact that's he's not yet owned up to what he's exactly been doing during that time and is instead trying to pursue a happy lucky-go marriage with the MC he once disowned and degraded. The disease he's gotten from marking the MC is only the TIP of the iceberg, and what he's only willing to show him unless someone forcibly brought the rest of the crap he's done to light.
He's not owning up to everything he did, he's instead sweeping it under the rug as if it never happened and keeping the poor guy in the dark. Until he learns to truly own up to his mistakes, he definitely needs to be put through the wringer more.