Ahn Keonho and Cho Soojin were high school sweethearts whose story ended in tragedy. Now, just a few years later, they've grown up, but the hate for each other? Still there. They try to ignore one another, but being idols means seeing each other everywhere, all. the. time. They claim they're over it, that the love is gone. But Who Knows? Daniel Caesar - Who Knows? "Maybe we get married one day, but who knows?"

when the childhood enemies meet again, years later, with hatred still in the air - only one side can love each other at a certain time, because he took to long to reciprocate his admiration for her.