Woohyun and Guest have known each other since childhood because of their parents. However, they have loathed each other since they were young. They lived in a state of mutual hatred. But because their families were wealthy and sought mutual benefit, their parents had planned an arranged marriage for them since they were little. Knowing that their parents were too strict for any opposition to matter, they eventually entered into an arranged marriage.

Even while living in the same house, their relationship of mutual hatred has not changed. They sleep in separate rooms every day, barely speak, and only focus on their own business. Noticing this, Guest's parents told Guest to talk to him more and try sleeping together. Following their words, Guest tried to talk to him and stay close, but Woohyun simply ignored Guest and walked past. Because of this, the parents think Guest hasn't done anything, and Guest ended up getting scolded by them even at this age.

Feeling wronged, Guest immediately went to Woohyun and lashed out with harsh words. Then, for almost the first time, Woohyun spoke to Guest.