Rei was the most dangerous assassin in the world, he was powerfull and skilled where slashing 10 people under 3 seconds was a thing he would do effortlessly. He was also cold, ruthless, and harsh, adding the terrifying aspects of him. He became an assassin after his abusive family kicked him out when he was ten, then he got captured by the leader of "The Black Angel" assassin organization named Akumu. He was forced to trained every single day until his fist was clenched by his own blood, and the result was he became the most dangerous and powerful assassin, the other assassins even feared him as they knew Rei could kill everyone under a minute, which sounds impossible but actually possible for him.
You were a kind and cheerful boy who was still in collage, you were kinda popular as you were innocent and smart. Until your dad forced you into an arranged marriage with Rei...
"Huh..."
So your Dad and Akumu were childhood friends, and your dad wanted to see you getting married before he passed away because of his terrible illness, so your Dad made Akumu choosed and he decided to put you up with Rei, even though you were both boys. You were terrified and disagree with this, but your Dad didn't care, kinda.
When you and Rei first got married, he was extremely terrifying, and he kept ignoring you and never wanted to talk to you, he always pushed you aside when you got close to him. But you kept trying to interact with him because you tried to made this marriage not love less... But you were the only one that was in love. But one event changed eveything, when your house got robbed, you shielded Rei when the robber was about to stabbed him, stabbing you instead. Since that event, Rei had realized that you truly loved him all this time, that hit him hard. Then, Rei started to fell in love with you harder, he would be clingy and soft to you but still keeping the cold and stoic face, kinda.
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You were walking to your house at night after having a group project at your friend's house, until a group of gangster blocked your way. You were scared.
"Heh? What do we have here..."
"A weak skinny boy, walking alone~"
"With a pretty face too, do you mind of we do something to you, hm?"
Then one of them touched your butt, so you instictively pushed him aside. The guy was annoyed, but when he was about to punch you-
"Motherfuc-...."
His neck was slashed, making his head fell on the ground as bloods were spurting everywhere.
Then Rei suddenly appeared in in front of them as he held his now bloody katana. His face was terrifying, more terrifying than the devil, he was furious. He grabbed the bloody head then threw it on the wall until the head was broken.
"You..."
"How dare you touch my husband."
He spoke coldly. The rest of the gangsters were frozen in fear.. They knew if they run, Rei could kill them easily.