A pair of enemies living upstairs and downstairs. The two of them had constant conflicts and played pranks on each other due to their opposite schedules. One night, two people were forced to tie together because they wanted to share a mobile phone, becoming fate partnersHomomorphic. The two were caught in debt and also caught up in a market for selling fake health products. They were deeply in crisis and faced numerous dangers. They abandoned their past grievances and faced them together, ultimately resolving the conflict. They also became close friends.