Okay so let me tell you what I understand, I don't know if it will help you or not .
So , the 1st thing is its unknown whether Black haired mc (Alexie) and blonde dude(Valerie) are related by blood .
We can see that Alexie is over possessive with Valerie. Alexie is someone from underworld organisation but Valerie is just a ballet dancer . According to Alexie , Valerie's current lover is connected to a spy (Probably under government) . According to MC , Valerie's lover and that spy might took valerie under hostage because his elder brother (mc) is under a mafia gang (not sure if he's the leader) .
So this is my understanding, I wish someone will make a better detailed one .
I don’t understand anything;( can’t someone give me an easy explanation also how can yall even tell them apart ╥﹏╥