"Watch closely from now on. This is what you're asking about." Hong Cha-eun, the only daughter of the Piggy Gamjatang Restaurant. Kwon Hae-gang, national swimming team athlete and son of the director of the Sewoon School Foundation. The only thing they had in common was that they attended the same school and were in the same class. But after Hae-gang accidentally discovers her secret, a tenacious and bitter entanglement begins... Eight years after their worst breakup, they meet again. From enemies, to coworkers... and then what comes next?