Alternative
여동생이랑 비밀 레슨
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Summary
“I heard you’re good at sex.” Jinyoung, known among his friends as “Sex Professor,” is actually inexperienced and as single as could be. However, when his 20-year-old sister, Bom, questions him, Jinyoung pretends to be experienced and lies. After that day… Every night, my sister now comes to my room without our parents knowing. This is a problem.
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