"take me back to the night we met."

You and Ryu used to be friends, yes...in the past, now you are enemies. You used to know Ryu in high school. Previously, Ryu was someone who had difficulty socializing, but luckily he met you. In the end he had a lot of friends and it was thanks to your help, you got closer day by day and one night, Ryu gave you a message to meet him in a park, at that time he was seen carrying a bouquet of flowers and sure enough, he liked you. Of course you accepted it, you were in a relationship until you went to college, yeah that was quite a long time, but that ended when you started working as a group of professional killers or mafia.