Perverted, gloomy, stalker strong top x adorable yet assertive beautiful strong bottom

The loss of memory became an inexplicable contractual bride with someone else, and she desperately tried to recover her memory, only to find herself stuck in the contract, unable to extricate herself from it...

Clearly they are brothers, but they are as different as night and day. The elder brother shines like a star in the night sky, while the younger brother is like dirt and dust, not worth looking at.

With a face that bewilders the masses, he attracts the attention of numerous girls, even though he doesn't actively pursue them.