Whats That Down There (raw)

Synopsis

Yuki came to the house of his younger brother who he knew after taking a vacation to work. Ryo, whom I met after a long time, grew up pretty and wonderfully enough to be thrilled with the same girl, but involuntarily. Yuki opens her eyes because of the time when everyone was asleep, Ryo secretly hiding under the blanket - wait a minute... I thought it was a woman, but what's that down below!

Also known as 여잔줄 알았는데 아래에 그건 뭐야!