Blood of the convenant

Is blood really thicker than water?
After the death of his parents, the gentle and shy Luhan travels to Korea to stay with his cold and emotionless half brother , Suho.
Will Suho ever accept him?
To complicate matters further, an unexpected secret is discovered.
And Suho's is life in danger as he seems to be a target of an assassin. Will Suho open his heart to his brother. How much is Luhan willing to sacrifice to save his brother?
NOTE: Age of the members of EXO is not accurate here. Basically, Luhan is the maknae and everyone else is older than him. ¯\_(ツ)_/¯