the article was about the school violence incident. Seoin's brother and a few others attacked Yeongwoon on the day Seoin was leaving. Seoin's mother covered everything up and paid Yeongwoon off to keep quiet. Seoin knows about the article and the incident, but doesn't know that the victim was Yeongwoon and this why he couldn't make it to the airport that day. Yeongwoon doesn't want Seoin to find out because he knows hell blame himself or he just doesn't wanna hurt him. The gangster and Haeyool figured out that the victim of the attack was Yeongwoon. The gangster by going to his home and finding him all injured and I don't remember how Haeyool figured it out, but I could look it up if you want me to. Seoin is the only one who doesn't know yet, so "he's in the dark"

I kinda lost the plot for letting this marinate. what was in the article and what do they mean by keeping seo-in in the dark?