A sister-in-law who lacked confidence in her appearance and lived avoiding the public eye. It was her younger brother-in-law who guided her in makeup and clothing choices. She began to change little by little, with a refined smile and polished beauty. Eventually, she started attracting attention from those around her, causing her brother-in-law's heart to stir. 'I...' 'I've liked you for a long time,' but what came back was rejection. 'We're...'siblings', so I couldn't give up my feelings. Amidst this, the two of them made a 'promise.' — No need to insert. Just want to overlap. However, unable to resist the overflowing heat, they ended up crossing that forbidden line. It was supposed to be just once. Even so... she kept her distance. 'I didn't want to be hated... because I fell in love.' Between sin and love, the two of them sought each other out many times. There's no turning back now.
