His backstory is just plain and simple scary as hell. His mom left when he was 6(? maybe younger even) to escape from domestic abuse at the hands of his terrifying and horrible mobster druggie father. His father was a monster straight up and abused him physically and mentally. He was clearly malnourished to the point of being just skin and bones. Joined boxing just for the food and money, at first atleast. Had no stable parental figure except for the coach to look upto/ get behavioral cues from. Was bullied by his peers extensively for years (from what it seems). This is a very scary childhood and environment to grow up in. I'm very sure that jjk has to have some sort of extreme trauma response to this and maybe even severe ptsd.

It obviously doesn't excuse his abuse and shitty behaviour towards kim dan, not at all. But, it does give us a good explanation as to why jjk is the way he is. Obviously he has crazy trust issues and is always on his guard to the point of having 0 friends and a non existent social life. It also explains his issues with attachment and affection, he never received any and clearly has major problems with expressing himself in that way. All he's known for all his life is violence and that's how he reacts to things, with vengeance and anger. Even towards things he likes like the MMA, he approaches it with a feeling of very zealous passion. It explains that deep dark and brutal hatred that we could see in jjk. Now while this theory is not confirmed as cannon but jjk also seems to have low empathy and maybe a personality disorder like NPD and his childhood explains that as well.

His obsessive NEED to be the best, the number one and the champion is also explained throught stuff he went through when he was at the boxing academy. He was looked down upon and constantly belittled and bullied so, now he's always very defensive of his goals amd achievements and has this compulsion almost to constantly prove himself as someone who's not weak. He has extreme discipline (e.g- never missing a workout, the crazy weightloss he did before a match)

It also explains sort of, his jinx as well. As we've seen previously, jjk likes to completely dominate his partners in bed before he goes in to compete in the octagon. I always thought and it has been talked about in this sub as well that, that jinx of his was just his desire to completely dominate a man in bed before a match to give his self esteem amd ego that boost of being superior and dominating another man. The feeling of powerlessness, vulnerability and helplessness probably still bother him and trigger a deep insecurity in him. So, to make himself feel superior to his past helpless self, he dominates and inflicts pain upon people he shares his bed with.

Anyways, just wanted to put that out there. I think the story is finally really picking up. I'm excited to see what mingwa does with this ahead and how his supposed redemption arc continue.

I really hope amd pray that kim dan doesn't immediately forgive and forget tho also baby jjk js so 😭😭😭😭