Just my opinion, I honestly do not agree with this statement. First of all, I would be happy to see Ijin's weaknesses grow. Not in a fight or his combat, but his friends and family. I do not think it matters whether or not it is female or male who becomes his weakness, but as long as he gains one, I would be glad. Why? Because Ijin would finally understand friendship and love. Ijin would understand why people do something for others for their sake without having anything for himself in return or having any debt. He would turn more human. And plus, what is there to complain if he does get a weakness? You get more action in the manhwa and more badass Ijin.
I completely respect your opinion, you do have a point. But, as for Ijin having a weakness aside from his family already, i think wouldn't complain really if that's what's gonna happen (ml driving the plot and all and Ijin saving them and stuffs). Saw it coming. Or i also could be wrong, hm, who knows, it's still too early to make such assumptions lol, let's just see where it goes ig xD

If I'm to be honest, I don't hate the people from the SW company; In fact, I think that they are quite enjoyable. I think investigating Ijin was the sensible thing to do. I mean if you lived your life always in danger doesn't that want you to always be vigilant? Not to mention that she literally almost got kidnapped a few weeks prior to her appearance. Also, in regards to her being clingy, I think it is fine. In fact, it is not only women who are clingy to him, men too, get clingy. Regardless of gender or background. Why? because he attracts people, he is charismatic, and not to mention he is cool. Anyone would want to befriend someone like him so I think I would understand her wanting to talk to him. If I am to be honest, I don't think people would complain as much if the genders were reversed. What Yuna did was sensible especially for her circumstances. Additionally, the things Jaehyung and Hyukjin were not okay. They were bullying his classmates and they were even thinking about beating him up after school. I do not see anyone talking about this especially after they started hanging out with Yungchan. I am not saying that I hate them in fact, I like them now. I just don't understand the hate Yuna is getting. Let's not talk about Yuna's cousin tho...