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Hajoon is a scumbag, he drugged Mirae when he found out he was at Jitae home. He lured him and thankfully Jitae followed him (like he told Mirae that there's something you should know etc. just read it in chapter 37 or somewhere around chapter 35 something I forgot. Sorry, I have a fish brain who easily forgot things). He also fucked Jian life (I mean it was partly Suryeon who made him miserable but he was technically part of it since he gave drugs to Jian and fucked him when he is high even tho Jian is aware and with consent). It was Suryeon fault tho since she was the one who planned things and Hajoon was the accomplice (this is what I remembered but feel free to correct me though).
I just hope Suryeon and Hajoon gets what they deserve (torture, pain and all the bad things in this world give it to them please).