Uhh spoilers if you want them xD
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If you're fine with the white haired 2nd ML being a pyscho his yours.
When Jaewon (MC) rejected him 2nd ML tried to kill him by choking him. Like if I can't have you, no one can type of sht. Also, 2nd ML didn't see Jaewon as Jaewon, he couldn't moved on from "hyung" that who died and kept seeing MC as someone else when MC corrected him saying "my name is Jaewon" the 2nd ML said "you don't need a name, you just need to be hyung"
Nope, they're not blood related. This "hyung" is called Jeosung? or something he just basically looks exactly like our Jaewon (mc).
And--NO ML doesn't like him romantically he just respect him as his tutor/teacher while 2ND ML has feelings for him. They call him "hyung" coz basically it's what they call older guys from korea. Hyung or Jeosung whatever his name has a serious illness and ML did not kill him, 2ND ML just think he killed him coz ML didn't even try or persuade "hyung" to get treatment.
2ND ML is fixated on Jaewon coz he looks like "hyung" basically he just see Jaewon as replacement/substitute and if you noticed 2ND ML doesn't really call him his real name and only "hyung".
Jaewon even said "my name is jaewon, not hyung" which 2nd ML replies "you don't need a name, you just need to be hyung"

if MC doesn’t want the handsome silver hair guy, can I have him? Pretty pleaseeeee (≧∀≦)
(I want him to be happy… maybe he gets a side story or smth, that‘d be so cool (≧∀≦)(≧∀≦)