If looks could kill, Jaebum and Mark must be burnt now with how Jinyoung stared at them with mixed of agitation, irritation and jealousy. He’s been monitoring their practice or flirting in Jinyoung’s perspective for Jaebum’s demonstration. He may prevented this if only he said yes when Jaebum asked him to be his partner but thanks to his uncontrollable heartbeat that knocked out the air in his lungs he became mute and Jaebum may misunderstood that as a rejection and asked for Mark instead who agreed.