I thought of the rooftop and then I thought of Gray, so that's how this idea exists.
1. Gray Yeon
Pushing someone off the rooftop or hitting them too hard with one of his improvised weapons.
2. Alex Go
He'd be a stabby boy.
3. Ben Park
He'd punch a person so hard that when they'd lose their consciousness and fall on the ground, they'd hit their head way too hard.
4. Gerard Jin
Scarily well planned murder.
5. Eugene Gale
He's way more likely to get killed than to actually kill someone.
6. Rowan Im
Elbowing way too hard in the throat.
7. Teddy Jin
There's also a scarily well planned murder for him.
8. Donald Na
Beating someone up way too bad.
9. Wolf Keum
Just like Donald.
10. Jake Ji
He'd suffocate the person he's killing.
11. Jimmy Bae
He'd hit people in the head with a hammer.
12. Forrest Lee
He'd push someone in front of a train.
13. Dean Kwon
Strangle. At least the person who dies could enjoy their last moments.
14. Eunchan Hong
100% poisoning.
15. Grape/Sam Lee
He'd beat people up to death.
16. Stephen Ahn
I don't think that he'd ever kill someone.
17. Jack Kang
Drowning. He just has the face of someone who'd drown people. (He'd most probably drown Jimmy in love and affection)
18. Kingsley Kwan
Poisoning too.
19. Dongha Baek
He'd torture his victims in the most cruel ways possible, but he'd make sure that they won't die because of that, they'd die because of starvation.
20. Sangmok Do
Axe in the head.