They actually never dated. The other guy has been onbsessed with Kang Jinha since Jinha moved to china. The Chinese guy literally hired people to bully Jinha to seem like a hero and "come to Jinha's rescue" the Chinese guy was trying to win Jinha over but was exposed and Jinha saw that the Chinese guy was a terrible person. Also if you pay attention you will see that Jinha has actually liked Siwon since they were little. I hope other people read this and realize that the Chinese dude and Jinha never dated
obsessed*
Oh Fuck, That Ex has Seme Look... . Now my ovaries are gone....