Euninui Ttaldeul

Se-Chan has always been grateful to Daniel, his foster father for helping him after his own father passed. One day, two women barge into his house, claiming to be Daniel's daughters. Unaware of their impure intentions, Se-Chan gets tempted by their gorgeous looks and ends up crossing the line.
"You've been staring at my body the whole day."
(Source: DAYcomics)