This is just my hunch...
What if Jeongyoon asked/colaborated with the red-haired guy to make Hyeonsoo's crush his gf so Jeongyoon can take Hyeonsoo himself?
It seems the red-haired guy knows Jeongyoon likes Hyeonsoo.
Someone waaay back, who seems to have read the novel, said that they were hookup partners once, and just when redhead started liking Jeongyoon, he said that he was interested in Hyeonsoo, so redhead snatched Hyeonsoo's crush as some sort of revenge.
I read this MONTHS ago, and I don't know how to find the translated novel unless I pay for it, so take this with a grain of salt because I don't even know if I'm remembering well.
Since that person started bringing up the past, why not tell everyone the whole truth? JK was very young back then. Show them how you started from the very bottom and worked your way to the top. That’s not something to be embarrassed about—it can inspire others who are struggling like he once did. With the right approach, you can even turn the story into something positive in your favor.











What if Cha dog see his husband and children with another man and they seem more like a family?