(sorry for the incoming long reply lawd)
no, it's up to you to like a character or not!!
and sorry if i sounded a bit mean in my last reply omg, i just really love hyesung, my boy did nothing wrong
but since i now know you actually didn't read all of the first story, i'll lay out why calling hyesung irritating is a bit ignorant.
hyesung, by the time he was 20 years old:
- escaped his abusive father's house
- became homeless + couldn't graduate hs as a result
- recently discovered he was actually an omega cause an alpha more than 5 years older than him (dojin) assaulted him
- could not be employed because he was now an omega so he no longer had a way to survive by himself
- now had to consider the possibility of being assaulted
- was almost trafficked because he had his naivety and desperation to have his old life living as an alpha back get taken advantage of
- got saved by the alpha that assaulted him and became indebted to him
- was faced with the illusion of choice when that alpha offered him to stay at his house (its an illusion of choice because it was either he actually survive by taking dojins offer or living with kyungsoo where his creepy alpha roommate also lived or denying both and living on the streets. there's clearly a better option)
- continued to have his heat get taken advantage of by that alpha
- got pregnant by that alpha even though he was only 19 + uneducated + unemployed
- entered a contractual relationship with that alpha because he thought that was the only way he could survive
- found out he was being bribed into being baby-trapped all throughout his pregnancy so he tried to run away even forgetting about the pay he was promised (which he overheard when he was trying to see his baby)
- almost died because he had unknowingly bonded with the alpha that got him pregnant
- now had no choice but to go back to being with the alpha because otherwise he would literally die (but he cared about his baby)
- ultimately got BOND-TRAPPED into being with the most red-flag/toxic/possessive alpha known to mankind
calling hyesung "irritating" has this underlying implication (read: IMPLICATION) that the anger he showed throughout the series (because throughout LIAI, that was what his character mainly showed, im guessing that is what you don't like about him, BUT CORRECT ME IF I AM WRONG!!) was unjustified and dramatic. it's a discouraging way to describe him, since the largest part for why he acts that way is because he was let down so many times by everyone, and yet, ended up being one of the most compassionate characters. the people around him just keep disrespecting him :(
but yes, we both agree that hyesung and dojin should not be a couple lol, THAT UGLY AHH BOND NEEDS TO BE BROKEN SO HE CAN DIVORCE HIM

I don't understand why people like Hyesung's character so much, I find his character very irritating.
Byul's character is way cuter!