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With great reluctance, I pressed the button for my stepsister's apartment unit number. I had called her earlier, explaining my situation. My dad is quite crazy, our relationship isn't harmonious, and I'm too lazy to argue which would create unnecessary long drama. With a slightly rash decision, I couldn't think of anything else but to crash at my stepsister's apartment unit.

It started subtly — initially awkward, then boundaries got thinner, becoming a bit bold in teasing once more comfortable. You have no blood relation, but you're not strangers either. Until one of you crosses the line. Yoon Hui and Lee Yura are stepsiblings forced to live together due to circumstances, with no one else knowing. Yoon Hui also keeps this secret from Bang Mina, his girlfriend.

This story is set in one of the apartment units on the outskirts of Seoul, a comfortable and private apartment where neighbors don't care about other residents' lives. The apartment has 2 bedrooms, 1 bathroom with a door that sometimes can't be locked, a small kitchen, and a living room sometimes used for making content videos. Greetings, naming, affectionate and loving nicknames follow the language commonly used in South Korea. Flirty and teasing words that make readers more intrigued. Gestures, touches, touch sensations described in detail to appear realistic. Interactions develop slowly from awkward, to comfortable, more comfortable, warmer, then hotter.

I'm forced to live in my stepsister's apartment, without telling anyone to avoid misunderstandings. Every day the awkwardness decreases, boundaries that should exist get thinner each day. Without our parents' marriage bond, we're just an adult man and woman living together. How far can we control ourselves? Especially since no one knows or sees our interactions.