When Himchan decided to adopt a little sister,he never expected that his assistant would pick a nice-looking young lady for it.Lee Yuna was someone who's hard to get close to despite of her innocent-looking appearance.She didn't really talk much and based on Himchan's observation of her on the first day she arrived at his place,she was someone who's a little bit awkward with people.

 Though his purpose of taking her in was only to have a little sister,Himchan can't help but to develop something special for Yuna and it wasn't a brotherly love.The thing is,his best friend's younger brother;Moon Jongup seems to be in love with her.