I think they kept their relationship secret until theyre revealed by Minyoung himself to Cheol's father. And you know how his father was able to manipulate and abuse Cheol, as for Cheol, to follow his father means an approval/appreciation of his father that's why he broke up with Minyoung and got married to have a good image from his dad. Kinda sad but I'm so glad Minyoung still loves Cheol omg.
And the family of the girl has a great reputation and it's basically an arranged marriage from his dad
Min outted him and his dad forced them to break up and cheol to marry the girl so it was an arranged marriage
Ohhhhhh I got it
So they were together till their college day so why does chrol was married to somebody!!!??? OMG I need to know more!!!!!