Jojo break up with Sun Oh, he stays with his girlfriend. And Jojo choose Hye Yeong...
Yes but she can't remove the shield from the Love Alarm, so she never rings Hye Yeong's alarm. The creator explains her that she actually always like Hye but she was confused because she can't sound his alarm. In the end, the creator gives her a copy of what her love alarm would have done if it hadn't had the shield and it show the scenes where Jojo might have sounded Hye Yeong's Love Alarm.
And Jojo choose Hye Yeong...